A patient asks, "What does SPF 15 mean for a sunscreen?" What should the nurse respond to this patient?
A) "SPF 15 is the ratio of the number of minutes for treated versus untreated skin to redden with exposure to ultraviolet B rays."
B) "SPF 15 is the number of times it takes to be applied before it will prevent sunburn."
C) "SPF 15 is the number of minutes that a person is permitted to stay in the sun after applying the product."
D) "SPF 15 is the number of days that the product needs to be used before it prevents sunburn."
A
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