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According to the passage, alcohol abuse can lead to which of the following problems?

A an impairment of kidney function.

According to the second paragraph, the kidneys usually limit magnesium excretion in the urine, but alcohol abuse and/or certain medications may affect this function. Impairment of this kidney function may lead to magnesium depletion. The passage does not state that magnesium uptake—a function of the intestines—is affected by alcohol.