This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Sex-Hormone, Subject name: Pharmacology
[{'content': 'Irreversible aromatase inhibitor - \nSelect and explain. \nA. Anastrazole, B. Exmestane, C. Letrozole, D. Vorozole', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Exmestane Aromatase inhibitors are of two types:o Type I (steroidal) aromatase inhibitor - They cause irreversible inhibition of aromatase, e.g. Exmestane, formestane.o Type II (non-steroidal) aromatase inhibitor - They cause reversible inhibition of aromatasxe e.g. Anastrazole, Letrozole, vorozale.", 'role': 'assistant'}]