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': 'The most appropriate drug for emergency contraception is : \nSelect and explain. \nA. Misoprostol, B. Ethnyl estradiol, C. Levonorgesterel, D. Mifepristone', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Levonorgesterel', 'role': 'assistant'}]