This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
False about pernicious anemia 
Select and explain. 
A. severe lack of intrinsic factor, B. Autoimmune disorder against parietal cells of stomach, C. Atrophy of all layers of body and fundus, D. Serum gastrin level is decreased
D: Serum gastrin level is decreased
Answer: D: Serum gastrin level is decreased 
Explanation: Serum gastrin level is raised and serum pepsinogen 1 levels are low.