请看下面的新GRE阅读短文练习。
People whose bodies cannot produce the substance cytochrome P450 are three times as likely to develop Parkinson's disease, a disease that affects the brain, as are people whose bodies do produce this substance.Since cytochrome P450 protects the brain from toxic chemicals, toxic chemicals probably play a role in the development of Parkinson's disease.
Which of the following, if true, most strongly supports the argument?
(A)It will soon be possible for cytochrome P450 to be synthesized for the treatment of people whose bodies cannot produce this substance.
(B)Many people whose bodies are unable to produce cytochrome P450 lack the ability to produce certain other substances as well.
(C)Cytochrome P450 has no effect on the brain other than to protect it from toxic chemicals.
(D)People with Parkinson's disease often exhibit a marked lessening in the severity of their symp-toms when they are treated with dopamine, a chemical produced naturally in the brain.
(E)Many people with Parkinson's disease have the ability to produce cytochrome P450 naturally.
答案：C
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