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Ultraviolet (UV) "light" is a type of electromagnetic radiation. There are two main types of UV radiation, UV-A and UV-B. Sunscreens first developed to prevent sunburn were good UVB absorbers, and the measure of their protection is called the SPF, or sunburn protection factor. These however offer little protection against UV-A rays, which have no immediate visible effects. UV-A rays are responsible for: A. Cancers B. Skin aging C. Long term, oxidative stress- induced skin damage D. A, B, C E. B and C
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