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': 'Androgen receptor blocking drug is : \nSelect and explain. \nA. Tamoxifen, B. Cyproterone acetate, C. Mifepristone, D. Nalondrone', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' Cyproterone acetate Cyproterone acetate is a Potent Antiandrogen competes with dihydrotestosterone for the intracellular androgen receptor and inhibits its binding.", 'role': 'assistant'}]