Physiology Endocrinology and Reproduction 93c08d80 Active from of vitamin D is: A Cholecalciferol B 24, 25 (OH) 2 Vit-D C 1, 25 (OH) 2 Vit-D D 25-OH Vit-D High-Yield Explanation Ans. (c) 1, 25 (OH) 2 Vit-D(Ref: Ganong, 25th ed/p.377)The active form of vitamin D is called 1, 25- dihydroxycholecalciferol or calcitriol