Exposure to which is essential for vitamin D synthesis in the skin?

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Multiple Choice

Exposure to which is essential for vitamin D synthesis in the skin?

Explanation:
Sunlight provides ultraviolet B radiation that enables the skin to synthesize vitamin D. UVB photons hit 7-dehydrocholesterol in the skin’s epidermis and convert it to previtamin D3, which then becomes vitamin D3 the body can use. Without this sun-driven UVB exposure, the skin can’t produce enough vitamin D, though it can come from certain foods or supplements. Cold temperature and drinking water don’t trigger vitamin D synthesis, and while higher altitude can increase UV exposure somewhat, the essential factor is exposure to sunlight.

Sunlight provides ultraviolet B radiation that enables the skin to synthesize vitamin D. UVB photons hit 7-dehydrocholesterol in the skin’s epidermis and convert it to previtamin D3, which then becomes vitamin D3 the body can use. Without this sun-driven UVB exposure, the skin can’t produce enough vitamin D, though it can come from certain foods or supplements. Cold temperature and drinking water don’t trigger vitamin D synthesis, and while higher altitude can increase UV exposure somewhat, the essential factor is exposure to sunlight.

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