Which of the following statements is NOT true of prophylactic agents?
A) Some drugs, such as tetracycline and sulfonamides, increase the possibility of photosensitivity, so sunscreens should be used when one is exposed to UV waves.
B) Sunscreens have no effect on premature aging or in precancerous conditions, although these products do prevent cancer.
C) SPF is the ratio between the exposure of UVR waves and the time required to cause erythema with or without sunscreen.
D) The higher the SPF, the longer it takes to develop a tan, but this allows the person to stay in the sun longer.
Correct Answer:
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