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: Pharmacology
[{'content': 'Indication for intramuscular iron therapy is : \nSelect and explain. \nA. Pregnancy, B. Postpartum period, C. Emergency surgery, D. Oral iron intolerance', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]