The correct option is A Calciferol or ergocalciferol.
Vitamin D is called calciferol or ergocalciferol. lt is a steroid hormone that has long been known for its important role in regulating body levels of calcium and phosphorus, and in mineralization of bone.
Vitamin D in human body exist in two form :
(I) Vitamin D2, also called as ergocalciferol.
(II) Vitamin D3, also called as calciferol or cholecalciferol.