Which one of the following vitamins is- responsible for blood-clotting ?

C
K
E
D

The correct answer is (b), vitamin K. Vitamin K is a fat-soluble vitamin that is essential for blood clotting. It is also involved in bone metabolism and wound healing. Vitamin K is found in green leafy vegetables, broccoli, Brussels sprouts, cabbage, and liver. It is also available as a supplement.

Vitamin C is a water-soluble vitamin that is important for the immune system, wound healing, and collagen production. It is found in citrus fruits, tomatoes, broccoli, and strawberries.

Vitamin E is a fat-soluble vitamin that is important for the immune system, cell function, and protection against free radicals. It is found in vegetable oils, nuts, seeds, and green leafy vegetables.

Vitamin D is a fat-soluble vitamin that is important for bone health, immune function, and cell growth. It is found in fatty fish, eggs, and fortified milk. It is also produced by the body when exposed to sunlight.