This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Sex Hormones, Subject name: Physiology
The enzyme, 5a-reductase is responsible for: 
Select and explain. 
A. Conversion of cholesterol to pregnenolone and enhancing steroidogenesis, B. Conversion of testosterone to dihydrotestosterone, C. Aromatization of testosterone to estradiol, D. Increasing the synthesis of LH
B: Conversion of testosterone to dihydrotestosterone
Answer: B: Conversion of testosterone to dihydrotestosterone 
Explanation: Ans. B. Conversion of testosterone to dihydrotestosterone5 a -Reductase is the enzyme that converts testosterone to dihydrotestosterone. 5 a -Reductase is associated with increasing the most potent androgen, dihydrotestosterone, and reducing LH secretion. Estrogens are associated with female secondary sex characteristics, although some androgens regulate pubic hair development.