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': 'What is the indication for the usage of mifepristone? \nSelect and explain. \nA. Ectopic pregnancy, B. Fibroid uterus, C. Molar pregnancy, D. Habitual aboion', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Mifepristone, also known as RU486, is an antiprogestin that has been used for treatment of leiomyomas. Mifepristone diminishes leiomyoma volume by approximately half. Mifepristone, in combination with misoprostol or other prostaglandins, is available for the termination of early pregnancy. Ref: Hoffman B.L., Schorge J.O., Schaffer J.I., Halvorson L.M., Bradshaw K.D., Cunningham F.G., Calver L.E. (2012). Chapter 9. Pelvic Mass. In B.L. Hoffman, J.O. Schorge, J.I. Schaffer, L.M. Halvorson, K.D. Bradshaw, F.G. Cunningham, L.E. Calver (Eds), Williams Gynecology, 2e.', 'role': 'assistant'}]