This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Abortion, Subject name: Gynaecology & Obstetrics
[{'content': 'All of the following drugs have been used for medical abortion except: \nSelect and explain. \nA. Mifepristone, B. Misoprostol, C. Methotrexate, D. Atosiban', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. is d, i.e. AtosibanRef. Dutta Obs. 7/e, p 173Drugs used for Medical abortion:Prostaglandins:-Misoprostol-GemeprostMifepristoneMethotrexateTamoxifen', 'role': 'assistant'}]