Which one of the following is the correct matching of a vitamin, its nature and its deficiency disease?
(a) Vitamin-A - Fat soluble - Night blindness
(b) Vitamin-K - Fat soluble - Beri-beri
(c) Vitamin-A - Fat soluble - Beri-beri
(d) Vitamin-K - Water soluble - Pellagra
(a) Fat soluble vitamins are A, D, E and K. Deficiency of vitamin-A leads to night blindness or nyctalopia because vitamin-A is essential for synthesis of visual pigments (rhodopsin).