Multiple choice general knowledge

Exposure to sunlight helps a person improve his 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 skin oil into Vitamin D
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Ultraviolet rays from sunlight convert a compound in skin oil (7-dehydrocholesterol) into Vitamin D, which is essential for bone health and immune function. This is a well-documented physiological benefit of moderate sunlight exposure.

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