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': 'Dose of mifepristone (in mg) for post-coital contraception: September 2012 \nSelect and explain. \nA. 10, B. 20, C. 40, D. 60', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A i.e. 10 mg Post-coital contraception. Ten milligrams given within 72 h of unprotected coitus is used as a post-coital contraception', 'role': 'assistant'}]