This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Physiology
[{'content': 'Iron is absorbed actively in the \nSelect and explain. \nA. Stomach, B. Duodenum, C. Terminal ileum, D. Proximal ileum', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Most of the iron is absorbed in the upper pa of the small intestine: - Duodenum and adjacent jejunum contain most of the iron suitable for absorption. Ref: guyton and hall textbook of medical physiology 12 edition', 'role': 'assistant'}]