This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Osteoporosis, Sex Hormones and OCPs, Subject name: Pharmacology
The enzyme 5a reductase mediated conversion of testosterone to di-hydro-testosterone is NOT required for which of the following actions? 
Select and explain. 
A. Formation of male external genitalia in the fetus, B. Prostatic hyperophy in elderly males, C. Pubeal changes in the male adolescent, D. Spermatogenesis
D: Spermatogenesis
Answer: D: Spermatogenesis 
Explanation: Testosterone is required for F - Feedback inhibition of LH secretion I - Internal genitalia development S - Spermatogenesis H- Hematopoiesis