Multiple choice general knowledge

Exposure to sunlight helps a person improve health because

  1. the infrared light kills bacteria in the body

  2. resistance power increases

  3. the pigment cells in the skin get stimulated and produce a healthy tan

  4. the ultraviolet rays convert sin oil into Vitamin D
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

When skin is exposed to sunlight, ultraviolet (UV) rays penetrate the skin and convert a compound called 7-dehydrocholesterol into Vitamin D3 (cholecalciferol). This is the body's primary natural source of Vitamin D, essential for bone health, immune function, and overall well-being. The other options are incorrect: infrared light doesn't kill bacteria in this context, resistance power isn't directly increased by sunlight, and tanning is a side effect not the health benefit.

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