Which of the following is FALSE?
A. A 15- to 20-minute session in the tanning booth is equivalent in UV ray exposure to one full day at the beach.
B. The intensity of light in tanning booths is much greater than it is while sunbathing outside.
C. The majority of tanning beds today are safer than in the past because they emit short-wave UV rays that do not penetrate beyond the outer layer of skin.
D. Sunlight is a major source of vitamin D in humans and without enough of it, diseases such as rickets occur.
Answer: C
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