Pharmacology The enzyme 5a reductase mediated conversion of testosterone to di-hydro-testosterone is NOT required for which of the following actions? A Formation of male external genitalia in the fetus B Prostatic hyperophy in elderly males C Pubeal changes in the male adolescent D Spermatogenesis 💡 Explanation The enzyme 5a reductase mediated conversion of testosterone to di-hydro-testosterone is NOT required for which of the following actions? ✓ Correct Answer: D. Spermatogenesis