Bleeding of gums, falling of teeth, fragile bones and delayed wound healing occur due to the deficiency of which one of the following vitamins?

Vitamin C
Vitamin K
Vitamin D
Vitamin B

The correct answer is Vitamin C.

Vitamin C is a water-soluble vitamin that is essential for the growth and repair of tissues throughout the body. It is also necessary for the production of collagen, a protein that is found in skin, bones, and connective tissue. Vitamin C is also involved in the absorption of iron and the production of red blood cells.

A deficiency of vitamin C can lead to a condition called scurvy. Scurvy is characterized by bleeding gums, loose teeth, fragile bones, and delayed wound healing. It can also cause fatigue, weakness, and skin problems.

Vitamin K is a fat-soluble vitamin that is essential for blood clotting. It is also involved in the metabolism of calcium and phosphorus. A deficiency of vitamin K can lead to a condition called bleeding disorders.

Vitamin D is a fat-soluble vitamin that is essential for the absorption of calcium and phosphorus. It is also involved in the maintenance of bone health. A deficiency of vitamin D can lead to a condition called rickets in children and osteomalacia in adults.

Vitamin B is a group of water-soluble vitamins that are essential for the metabolism of carbohydrates, fats, and proteins. They are also involved in the production of red blood cells and the function of the nervous system. A deficiency of vitamin B can lead to a variety of symptoms, including fatigue, weakness, and skin problems.