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
Mechanism of action of clomiphene citrate is ? 
Select and explain. 
A. 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
B: Binds estrogen receptors & prevents negative feed back at hypothalamus
Answer: B: Binds estrogen receptors & prevents negative feed back at hypothalamus 
Explanation: 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.