LSAT PT79, S1 Logical Reasoning, Q21, People with higher-than-average blood levels of a …
Why is (E) the answer?
What if instead of X causing Y, Y was causing X?
If Alzheimer's disease was causing the higher homocysteine levels, then trying to reduce those levels is sort of treating a symptom not the cause. The intended goal of the argument, however, is to reduce the risk of developing Alzheimer's disease.
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