请教此题，怎么想不明白？
In tests for P, a serious disease, a false positive result indicates that people have P when in fact they do not: a false negative result indicates that people do not have P when in fact they do. To detect P most accurately, physicians should use the laboratory test that has the lowest proportion of false positive results.
题目问何选项支持以上建议？ 答案为 All laboratary tests to detect P have the same proportion of false negative results.
本题目的结论是：To detect P most accurately, physicians should use the laboratory test that has the lowest proportion of false positive results。 前面说无论是positive result 还是negative result 都会有错误。那么如果把答案中的话加入到题中，就是：如果所有的false negative results都一样的话，那么探测P的准确率只取决于false positive results.的多少，所以选比例最低的，一定可以达到最好的结果的。
No matter what happens ,tomorrow is another day !
I am hope!:)
