Rickets is caused by deficiency of–

Correct option is A

Sol. Rickets is a disorder in children caused by Vitamin D deficiency, leading to impaired bone mineralization. It results in soft, weak bones, bowed legs, delayed growth, and skeletal deformities. Vitamin D helps in the absorption of calcium and phosphorus from the intestine. Lack of sunlight exposure, poor diet, and malabsorption can contribute to this condition.
Explanation of each option:
· (a) Vitamin D – Correct. Its deficiency causes defective bone calcification in children, leading to rickets, especially in growing bones.
· (b) Vitamin A – Incorrect. Deficiency of Vitamin A causes night blindness, xerophthalmia, and increased susceptibility to infections, not rickets.
· (c) Vitamin B – Incorrect. Vitamin B-complex deficiencies result in disorders like beriberi (B1), pellagra (B3), and megaloblastic anemia (B12), not bone diseases.
· (d) Vitamin C – Incorrect. Vitamin C deficiency leads to scurvy, causing bleeding gums, joint pain, and delayed wound healing, not rickets.