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': 'Medical treatment of ectopic gestation involves use of all the following drugs except : \nSelect and explain. \nA. Prostaglandins, B. Methotrexate, C. RU-486, D. Dexamethasone', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Dexamethasone', 'role': 'assistant'}]