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
Following drug is aromatase inhibitor: 
Select and explain. 
A. Raloxifine, B. Tamoxifen, C. Leuprolide, D. Letrozole
D: Letrozole
Answer: D: Letrozole 
Explanation: 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.