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PS is an 87-year-old male admitted to a hospital for stomach pain. He has mild breathing problems and complains of fatigue and chronic stomach upset, for which he takes a daily antacid. While hospitalized, a physician has determined that PS has megaloblastic anemia.
Given PS's age and symptoms, what is a likely cause of the megaloblastic anemia?
A. excessive loss of blood from stomach ulcer
B. lack of folate from poor dietary habits
C. liver disease
D. lead poisoning
E. reduced B12 absorption due to inadequate intrinsic factor
Answer: E
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