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: Pharmacology
[{'content': 'Mechanism of action of clomiphene citrate is ? \nSelect and explain. \nA. Binds to estrogen receptors & causes negative feedback at hypothalamus, B. Binds estrogen receptors & prevents negative feed back at hypothalamus, C. Binds to progesterone receptors, D. Progesterone agonist', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Binds estrogen receptors & prevents negative feed back at hypothalamus o Induces gonadotropin secretion (LH, FSH) by blocking estrogenic feedback inhibition on hypothalamus.", 'role': 'assistant'}]