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': 'Ullipristal acetate is \nSelect and explain. \nA. GnRH agonist, B. Androgen antagonist, C. Selective estrogen receptor modulator, D. Selective progesterone receptor modulator', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Refer Harrinson 19/e p 2391 Ullipristal is a selective progesterone receptor modulator like mifepristone It is used as an emergency contraceptive that can be used within 120 hours of unprotected intercourse', 'role': 'assistant'}]