Multiple choice

Which of the following vitamins is synthesized inside the human body when exposed to sunlight?

  1. Vitamin A

  2. Vitamin B

  3. Vitamin C

  4. Vitamin D
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Vitamin D is synthesized in the skin when 7-dehydrocholesterol is exposed to UV-B radiation from sunlight, earning it the name 'sunshine vitamin.' This process converts the cholesterol derivative into previtamin D3, which then becomes active vitamin D. Vitamins A, B, and C must be obtained from dietary sources as the human body cannot synthesize them.

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