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
[{'content': 'Vitamin B12 is absorbed in: \nSelect and explain. \nA. Duodenum, B. Jejunum, C. Ileum, D. Stomach', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. Ileum Most vitamins are absorbed in upper small intestine but vitamin B12 is absorbed in the ileumQ', 'role': 'assistant'}]