This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Pharmacology
[{'content': 'Which of the following progesterone is used in emergency contraception? \nSelect and explain. \nA. Levonorgesterol, B. Microised Progesterone, C. Norgesterone, D. Depot Medroxyprogesterone acetate', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Levonorgestrel 0.75mg two doses12 hours apa, or 1.5mg single dose taken as soon as possible, but before 72 hours of unprotected intercourse. other emergency contraceptives- mifepristone, ulipristal (Ref.Essentials of medical pharmacology TD Tripathi 7th edition page no.322)', 'role': 'assistant'}]