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: Biochemistry
Site of absorption of Vitamin B12 
Select and explain. 
A. Duodenum, B. Iejunum, C. Ileum, D. Colon
C: Ileum
Answer: C: Ileum 
Explanation: Mnemonic Vitamin B12: 1 + 2 = 3
So maximum absorption in third part of small intestine. i.e: Ileum.