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': 'Following drug is aromatase inhibitor: \nSelect and explain. \nA. Raloxifine, B. Tamoxifen, C. Leuprolide, D. Letrozole', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. D. Letrozoleletrozole, anastrozole are aromatase inhibitor which is enzyme responsible for estrogen synthesis, this drug is indicated in estrogen receptor positive breast cancer resistant to tamoxifen. It can also be given precocious puberty.', 'role': 'assistant'}]