Exposure to sunlight helps a person improve his health because ________?
Correct answer: C. The ultraviolet rays convert skin oil into Vitamin D
- A. Resistance power increases
- B. The infrared light kills bacteria in the body
- C. The ultraviolet rays convert skin oil into Vitamin D
- D. The pigment cells in the skin get stimulated and produce a healthy tan
Explanation
UVB radiation starts the production of vitamin D in the skin from a cholesterol-derived precursor, which supports bone health and calcium absorption. The option's reference to skin oil is an oversimplification, but it identifies the correct sunlight mechanism among the choices.
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