Which of the following statements indicates the way in which the body's natural defenses protect the skin from the effects of UV damage?
A) The skin is protected by the synthesis of three pigments that contribute to the skin's color.
B) Carotene, which accumulates in the stratum corneum and hypodermal adipose tissue, is synthesized in large amounts in the presence of sunlight.
C) The skin is protected by increasing the number of Langerhans' cells, which help to activate the immune system.
D) Prolonged exposure to the sun induces melanin dispersion, which in turn acts as a natural sunscreen.
Answer: D