This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Vitamins, Subject name: Biochemistry
[{'content': 'Gastrectomy produces deficiency of which vitamin - \nSelect and explain. \nA. VitaminB6, B. Vitamin B12, C. Vitamin B2, D. Vitamin B1', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e.. Vitamin B12 o The intestinal absorption of vitamin Bu requires intrinsic factor (IF), secreted by parietal cells of the stomach.o In stomach vitamin Bt2 binds to IF to form vitamin Bn-IF complex which intum is absorbed by sepecific receptors on mucosal cells of the ileum.o Vitamin Buis also called as 'extrinsic factor' of castle.", 'role': 'assistant'}]