Disease due to deficiency of Vitamin D is:
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → Osteomalacia
Vitamin D helps the body absorb calcium and phosphorus from food, and these two minerals harden the bones. Without enough vitamin D the bones stay soft and weak: in children this is called rickets (bent legs, weak bones), and in adults it is called osteomalacia (softening of the bones, with bone pain and muscle weakness).
Why the other options are incorrect
Option (1) Night Blindness — Incorrect. It is caused by a deficiency of vitamin A, which the eye needs to see in dim light.
Option (2) Covid-19 — Incorrect. It is an infectious disease caused by a virus (SARS-CoV-2), not a deficiency disease.
Option (3) Scurvy — Incorrect. It is caused by a deficiency of vitamin C and shows as bleeding and swollen gums.