Which one of the following is a fat-soluble vitamin and it's related deficiency disease?
(a) Ascorbic acid - Scurvy
(b) Retinol - Xerophthlmia
(c) Cobalamine - Beri-beri
(d) Calciferol - Pellagra
(b) Xerophthalmia is caused due to the deficiency of vitamin-A (retinol). Retinol and calciferol are fat soluble vitamins but pellagra is not the deficiency disease of calciferol.