The active form of Vitamin D is

Correct option is C

Calcitriol (1,25-dihydroxycholecalciferol) is the biologically active form of Vitamin D.
· Cholecalciferol (Vitamin D₃) is synthesized in the skin and then converted to 25-hydroxycholecalciferol in the liver.
· The final activation occurs in the kidneys, forming calcitriol, which regulates calcium and phosphate metabolism.