1. _____ is used to synthesize vitamin D when human skin is exposed to UV radiation. A. Calcitriol B. Tocopherol C. Cholesterol D. Melanin E. Cortisol

1. _____ is used to synthesize vitamin D when human skin is exposed to UV radiation.

A. Calcitriol
B. Tocopherol
C. Cholesterol
D. Melanin
E. Cortisol

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1. _____ is used to synthesize vitamin D when human skin is exposed to UV radiation. A. Calcitriol B. Tocopherol C. Cholesterol D. Melanin E. Cortisol

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