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: Pathology
[{'content': 'Iron absorption is decreased by all except \nSelect and explain. \nA. Calcium, B. Tetracycline, C. Phytate, D. Ascorbic acid', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]