Why does exposure to sunlight or sunlamps darken skin?
A) UV radiation stimulates melanocytes to produce more melanin.
B) UV radiation stimulates melanocytes to produce more melatonin.
C) UV radiation stimulates keratinocytes to produce more carotene.
D) UV radiation stimulates keratinocytes to produce more keratin.
E) UV radiation stimulates melanocytes to produce more melanin and keratinocytes to produce more keratin.
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