This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Physiology
[{'content': 'maximum absorption of IRON is seen in? \nSelect and explain. \nA. duodenum, B. ileum, C. colon, D. jejunum', 'role': 'user'}, {'content': 'Answer: A \nExplanation: absorption of iron is maximum in duodenum. vit b12 absorption is maximum in ileum ref: guyton and hall', 'role': 'assistant'}]