Most potent form of vitamin D is -

Ans. is 'd' i.e., 1,25 dihydroxy cholecalciferol o 1,25 cholecalciferol also k/a calcitriol is active form of Vit. D.o Cholecalciferol in liver continued to 25 hydroxy cholecalciferol.o in kidney 25-Hydroxvcholecalciferol converted into 1,25-Hydroxy cholecalciferol.