This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nutrition & Digestion, Subject name: Biochemistry
Site of absorption of Vitamin B12: 
Select and explain. 
A. Ileum, B. Jejunum, C. Duodenum, D. Stomach
A: Ileum
Answer: A: Ileum 
Explanation: Ans. A. Ileum(Ref: Harper 31/e page 533-540)Site of absorption of Iron--Proximal DuodenumSite of absorption of Folic acid--Proximal jejunumSite of absorption of Cobalamin--Ileum