This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Contraception, Subject name: Gynaecology & Obstetrics
[{'content': 'Emergency contraceptive of choice is : \nSelect and explain. \nA. OCP, B. Danazol, C. Levonorgestrel, D. Mifepristone', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Levonorgestrol can be used as a single dose, can be given upto 120hrs following unprotected intercourse and no estrogenic side effects', 'role': 'assistant'}]