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
All of the following drugs have been used for medical abortion except: 
Select and explain. 
A. Mifepristone, B. Misoprostol, C. Methotrexate, D. Atosiban
D: Atosiban
Answer: D: Atosiban 
Explanation: Ans. is d, i.e. AtosibanRef. Dutta Obs. 7/e, p 173Drugs used for Medical abortion:Prostaglandins:-Misoprostol-GemeprostMifepristoneMethotrexateTamoxifen