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: Gynaecology & Obstetrics
[{'content': 'For fetal lung maturation, all the corticosteroids can be used except: \nSelect and explain. \nA. Betamethasone, B. Dexamethasone, C. Hydrocortisone, D. Methylprednisolone', 'role': 'user'}, {'content': 'Answer: D \nExplanation: DOC for fetal lung maturation is betamethasone. Methylprodnisolone is not effective because of poor placental transfer.', 'role': 'assistant'}]