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': 'Iron and calcium are absorbed in: \nSelect and explain. \nA. Colon, B. Ileum, C. Duodenum, D. Jejunum', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]