Progesterone is synthesized from: (A) Pregnenolone, (B) 17-Hydroxypregnenolone, (C) Pregnanediol, (D) Pregnanetriol
Answer is A. Pregnenolone is conveed to progesterone by the action of two smooth endoplasmic reticulum enzymes, 3a-hydroxysteroid dehydrogenase (3a-OHSD) and D5,4-isomerase.Ref: Harper&;s Biochemistry; 30th edition; Page no: 503