The correct option is A Co
Vitamins are important in nutrition as they are indispensable for normal body metabolism. They work as coenzymes for normal metabolic enzymes. Vitamin B complex and C are water soluble vitamins. Vitamin B12 is also called as cyano cobalamine or anti-pernicious anaemia factor or RBC maturingfactor". Vitamin B12 consists of mineral cobalt. This vitamin promotes DNA synthesis and maturation of RBCs. Its deficiency disease is pernicious anaemia. Important dietary sources are meat, liver etc.