D115 OA / WGU D115 OA PREP TEST BANK
2025/2026 WITH REAL EXAM QUESTIONS AND
CORRECT ANSWERS WITH RATIONALES/ WGU
D115 ADVANCED PATHOPHYSIOLOGY OA
PREP(NEW!)
BOLD ROTATION IN ITALICS – COMPLETE EXAM (QUESTIONS 1–48)
QUESTION 1
A 62-year-old male with a 30-year history of gastroesophageal reflux disease
(GERD) presents with progressive dysphagia, odynophagia, and unintentional
weight loss. Endoscopy reveals a stricture in the distal esophagus with biopsy
showing intestinal metaplasia. Which cellular adaptation is most directly
associated with his increased risk of esophageal adenocarcinoma?
A) Squamous hyperplasia
B) Barrett's esophagus with columnar metaplasia
C) Squamous dysplasia
D) Adenomatous polyposis
Correct Answer: B
Rationale: Barrett's esophagus is a premalignant condition where the normal
stratified squamous epithelium of the distal esophagus is replaced by intestinal-
type columnar metaplasia due to chronic acid reflux. This metaplastic change
significantly increases the risk of esophageal adenocarcinoma. Squamous
hyperplasia and dysplasia are not the classic Barrett's changes; adenomatous
polyposis is associated with colon cancer.
QUESTION 2
A 28-year-old primigravida at 10 weeks gestation undergoes chorionic villus
,sampling (CVS) for prenatal diagnosis. Which fetal structure does this procedure
sample to obtain genetic material?
A) Amniotic fluid
B) Fetal blood from the umbilical cord
C) Trophoblastic tissue from the placenta
D) Fetal skin cells
Correct Answer: C
Rationale: Chorionic villus sampling (CVS) obtains a sample of chorionic villi,
which are projections of the trophoblast (placental tissue) that have the same
genetic makeup as the fetus. This allows for first-trimester genetic diagnosis.
Amniotic fluid is sampled in amniocentesis; fetal blood is sampled in
cordocentesis; fetal skin cells are not typically sampled prenatally.
QUESTION 3
A 5-year-old male presents with recurrent episodes of wheezing, coughing, and
shortness of breath triggered by exposure to cats and pollen. His mother reports
that symptoms improve with albuterol. Which pathophysiological process is
primarily responsible for the airway obstruction in this condition?
A) Excessive mucus production and airway remodeling
B) Bronchospasm and airway inflammation with reversible obstruction
C) Alveolar destruction and loss of elastic recoil
D) Airway fibrosis and fixed narrowing
Correct Answer: B
Rationale: This presentation is classic for asthma, a chronic inflammatory airway
disease characterized by bronchial hyperresponsiveness, bronchospasm, and
reversible airway obstruction. Albuterol, a beta-agonist, relieves bronchospasm.
Excessive mucus and remodeling occur in chronic asthma but are not the primary
acute process; alveolar destruction is seen in emphysema; fixed narrowing is seen
in COPD.
, QUESTION 4
A 68-year-old female presents with a 6-month history of progressive memory loss,
difficulty finding words, and personality changes. Her symptoms began gradually
and have been worsening. She has no focal neurological deficits. Which type of
dementia is most likely, and what is the underlying pathology?
A) Vascular dementia – multiple small infarcts
B) Alzheimer's disease – beta-amyloid plaques and neurofibrillary tangles
C) Frontotemporal dementia – frontal and temporal lobe atrophy
D) Lewy body dementia – alpha-synuclein deposits
Correct Answer: B
Rationale: The gradual onset of memory loss, word-finding difficulty, and
personality changes without focal deficits is most consistent with Alzheimer's
disease, characterized by extracellular beta-amyloid plaques and intracellular
neurofibrillary tangles. Vascular dementia has a stepwise progression;
frontotemporal dementia presents with behavioral changes early; Lewy body
dementia has visual hallucinations and parkinsonism.
QUESTION 5
A 45-year-old female with systemic lupus erythematosus (SLE) develops pleuritic
chest pain, fever, and a pericardial friction rub. Which immune mechanism is
primarily responsible for the pericardial inflammation?
A) Type I hypersensitivity with mast cell degranulation
B) Type II hypersensitivity with antibody-mediated cytotoxicity
C) Type III hypersensitivity with immune complex deposition
D) Type IV hypersensitivity with T-cell infiltration
Correct Answer: C
Rationale: SLE is a Type III hypersensitivity disorder where circulating immune
complexes deposit in tissues, including the pericardium, pleura, and kidneys,
leading to complement-mediated inflammation. Type I is allergic; Type II involves
direct antibody attack; Type IV is T-cell-mediated.
2025/2026 WITH REAL EXAM QUESTIONS AND
CORRECT ANSWERS WITH RATIONALES/ WGU
D115 ADVANCED PATHOPHYSIOLOGY OA
PREP(NEW!)
BOLD ROTATION IN ITALICS – COMPLETE EXAM (QUESTIONS 1–48)
QUESTION 1
A 62-year-old male with a 30-year history of gastroesophageal reflux disease
(GERD) presents with progressive dysphagia, odynophagia, and unintentional
weight loss. Endoscopy reveals a stricture in the distal esophagus with biopsy
showing intestinal metaplasia. Which cellular adaptation is most directly
associated with his increased risk of esophageal adenocarcinoma?
A) Squamous hyperplasia
B) Barrett's esophagus with columnar metaplasia
C) Squamous dysplasia
D) Adenomatous polyposis
Correct Answer: B
Rationale: Barrett's esophagus is a premalignant condition where the normal
stratified squamous epithelium of the distal esophagus is replaced by intestinal-
type columnar metaplasia due to chronic acid reflux. This metaplastic change
significantly increases the risk of esophageal adenocarcinoma. Squamous
hyperplasia and dysplasia are not the classic Barrett's changes; adenomatous
polyposis is associated with colon cancer.
QUESTION 2
A 28-year-old primigravida at 10 weeks gestation undergoes chorionic villus
,sampling (CVS) for prenatal diagnosis. Which fetal structure does this procedure
sample to obtain genetic material?
A) Amniotic fluid
B) Fetal blood from the umbilical cord
C) Trophoblastic tissue from the placenta
D) Fetal skin cells
Correct Answer: C
Rationale: Chorionic villus sampling (CVS) obtains a sample of chorionic villi,
which are projections of the trophoblast (placental tissue) that have the same
genetic makeup as the fetus. This allows for first-trimester genetic diagnosis.
Amniotic fluid is sampled in amniocentesis; fetal blood is sampled in
cordocentesis; fetal skin cells are not typically sampled prenatally.
QUESTION 3
A 5-year-old male presents with recurrent episodes of wheezing, coughing, and
shortness of breath triggered by exposure to cats and pollen. His mother reports
that symptoms improve with albuterol. Which pathophysiological process is
primarily responsible for the airway obstruction in this condition?
A) Excessive mucus production and airway remodeling
B) Bronchospasm and airway inflammation with reversible obstruction
C) Alveolar destruction and loss of elastic recoil
D) Airway fibrosis and fixed narrowing
Correct Answer: B
Rationale: This presentation is classic for asthma, a chronic inflammatory airway
disease characterized by bronchial hyperresponsiveness, bronchospasm, and
reversible airway obstruction. Albuterol, a beta-agonist, relieves bronchospasm.
Excessive mucus and remodeling occur in chronic asthma but are not the primary
acute process; alveolar destruction is seen in emphysema; fixed narrowing is seen
in COPD.
, QUESTION 4
A 68-year-old female presents with a 6-month history of progressive memory loss,
difficulty finding words, and personality changes. Her symptoms began gradually
and have been worsening. She has no focal neurological deficits. Which type of
dementia is most likely, and what is the underlying pathology?
A) Vascular dementia – multiple small infarcts
B) Alzheimer's disease – beta-amyloid plaques and neurofibrillary tangles
C) Frontotemporal dementia – frontal and temporal lobe atrophy
D) Lewy body dementia – alpha-synuclein deposits
Correct Answer: B
Rationale: The gradual onset of memory loss, word-finding difficulty, and
personality changes without focal deficits is most consistent with Alzheimer's
disease, characterized by extracellular beta-amyloid plaques and intracellular
neurofibrillary tangles. Vascular dementia has a stepwise progression;
frontotemporal dementia presents with behavioral changes early; Lewy body
dementia has visual hallucinations and parkinsonism.
QUESTION 5
A 45-year-old female with systemic lupus erythematosus (SLE) develops pleuritic
chest pain, fever, and a pericardial friction rub. Which immune mechanism is
primarily responsible for the pericardial inflammation?
A) Type I hypersensitivity with mast cell degranulation
B) Type II hypersensitivity with antibody-mediated cytotoxicity
C) Type III hypersensitivity with immune complex deposition
D) Type IV hypersensitivity with T-cell infiltration
Correct Answer: C
Rationale: SLE is a Type III hypersensitivity disorder where circulating immune
complexes deposit in tissues, including the pericardium, pleura, and kidneys,
leading to complement-mediated inflammation. Type I is allergic; Type II involves
direct antibody attack; Type IV is T-cell-mediated.
