explain the types of vitamin.

Vitamins are classified into two groups depending upon their solubility in water and fat.

1. Water-soluble vitamins: Vitamin C, B-group vitamins (B₁, B₂, B₆, B₁₂)

2. Fat-soluble vitamins: Vitamins A, D, E and K

Some vitamins with their sources and the diseases caused by their deficiency are given in the following table.

Name of vitamins	Sources	Deficiency diseases
Vitamin A	Fish liver oil, carrots, butter and milk	Xerophthalmia, night blindness
Vitamin B1	Yeast, milk, green vegetables and cereals	Beri beri
Vitamin B2	Milk, egg-white, liver, kidney	Cheilosis, digestive disorders and burning sensation of the skin
Vitamin B6	Yeast, milk, egg yolk, cereals and grams	Convulsions
Vitamin B12	Meat, fish, egg and curd	Pernicious anaemia
Vitamin C	Citrus fruits, amla and green leafy vegetables	Scurvy
Vitamin D	Exposure to sunlight, fish and egg yolk	Rickets and osteomalacia
Vitamin E	Vegetable oils like wheat germ oil, sunflower oil	Increased fragility of RBCs and muscular weakness
Vitamin K	Green leafy vegetables	Delay of blood clotting