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
Finasteride acts by blocking: 
Select and explain. 
A. α-receptors, B. 5–α reductase enzyme, C. Androgen receptors, D. β–receptors
B: 5–α reductase enzyme
Answer: B: 5–α reductase enzyme 
Explanation: None