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: Physiology
Vitamin B12 is absorbed in: 
Select and explain. 
A. Duodenum, B. Jejunum, C. Ileum, D. Stomach
C: Ileum
Answer: C: Ileum 
Explanation: C i.e. Ileum Most vitamins are absorbed in upper small intestine but vitamin B12 is absorbed in the ileumQ