Question

exposure to ultraviolet light that is found in sunlight causes skin to darken by stimulating the production of:
a sweat
b oil
c melanin
d sebum

Explanation:

Melanin is a pigment produced by melanocytes in the skin. When the skin is exposed to ultraviolet (UV) light (such as sunlight), it stimulates melanocytes to produce more melanin. The increased melanin absorbs UV radiation, protecting the skin from damage, and also causes the skin to darken (tanning). Sweat is mainly for thermoregulation and excretion. Oil (sebum) is produced by sebaceous glands to lubricate the skin and hair.

Answer:

C. melanin