This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: FMGE 2019, Subject name: Gynaecology & Obstetrics
[{'content': 'What is the dose of mifepristone in emergency contraception? \nSelect and explain. \nA. 100 mg, B. 200 mg, C. 25 mg, D. 200 mcg', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Mifepristone is a highly effective and well-tolerated emergency contraceptive when given in a single dose of 15-50 mg within 72 h of unprotected coitus.', 'role': 'assistant'}]