Pregnenolone is not in the biosynthetic pathway of which substance?: (A) Coisol, (B) Estrogen, (C) DHEA, (D) 1,25(OH)2D
Answer is D. All the steroids listed include pregnenolone early in their biosynthetic pathway. 1,25(OH)2D is derived from vitamin D and does not include pregnenolone in its biosynthetic pathway.