Rate limiting enzyme in testosterone synthesis: (A) 17,20 lyase, (B) 20,22-desmolase, (C) 3-bHSD, (D) 17-hydroxylase
Answer is B. Cholesterol is first acted upon by desmolase and a 6-carbon unit is cleaved off, forming 21 carbon steroid, pregnenolone It is the common precursor for all the steroid hormonesRef: DM Vasudevan, 7th edition, page no: 664