求教费费24题

24.
                The interstitial nucleus, a subregion of the brain’s hypothalamus, is typically smaller for male cats than for female cats. A neurobiologist performed autopsies on male cats who died from disease X, a disease affecting no more than .05 percent of male cats, and found that these male cats had interstitial nuclei that were as large as those generally found in female cats. Thus, the size of the interstitial nucleus determines whether or not male cats can contract disease X.

Which one of the following statements, if true, most seriously weakens the argument?

(A) No female cats have been known to contract disease X, which is a subtype of disease Y.

(B) Many male cats who contract disease X also contract disease Z, the cause of which is unknown.

(C) the interstitial nuclei of female cats who contact disease X are larger than those of female cats who do not contract disease X.

(D) Of 1,000 autopsies on male cats who did not contract disease X, 5 revealed interstitial nuclei larger than those of the average male cat.

(E) The hypothalamus is known not to be causally linked to disease Y, and disease X is a subtype of disease Y.
            

想请问D为什么不对？既然说脑子大小不同就会得病，那么D说5个脑袋大的猫没得病不就削弱了么？

好心人啊，帮忙解决下吧

想请问D为什么不对？既然说脑子大小不同就会得病，那么D说5个脑袋大的猫没得病不就削弱了么？

       楼主, 好好醒醒.....

       1000个样本中的 5 个能说明什么问题?       ---  反过来, 还有可能是加强~, 995 个都得病啦..