GWD TN15的关于阑尾炎的拿到逻辑题

lainemai

Which of the following mostlogically completes the passage?

Appendicitis 阑尾炎(inflammation of the appendix) is potentially fatal;

consequently, patients withsymptoms strongly suggesting appendicitis almost

always have their appendixremoved. The appropriate surgery is low-risk but

performed unnecessarily inabout 20 percent of all cases. A newly developed

internal scan for appendicitisis highly accurate, producing two misdiagnoses

for every 98 correct diagnoses.Clearly, using this test, doctors can largely

avoid unnecessary removals ofthe appendix without, however, performing any fewer

necessary ones than before, since ______.

A the patients who are correctly diagnosed with thistest as not having

appendicitis invariably have medical conditions that aremuch less serious than

appendicitis

B the misdiagnoses produced by this test are alwaysinstances of attributing

appendicitis to someone who does not, in fact, have it

C all of the patients who are diagnosed with this testas having appendicitis do,

in fact, have appendicitis

D every patient who is diagnosed with this test ashaving appendicitis has more

than one of the symptoms generally associated withappendicitis

E the only patients who are misdiagnosed using this testare patients who lack

one or more of the symptoms that are generallyassociated with appendicitis

这道题纠结了好久好久好久......然后看了解析还是没明白为什么选B，解析是这样的：讲清楚误诊总是将没病的当成有病的切了，而不是把有病的当没病的切了。与结论方向一致，即使是误诊，也没有减少必要的手术。根据B，误诊等于不必要的手术，但毕竟
使用这个test的误诊率比以前低了很多，总的来说不必要的手术减少了.
楼主当时选了C，觉得C说的很多，所有被诊断患有阑尾炎的病人确实事实上是患有阑尾炎，那么这样就可以加强CONCLUSION:不减少必要的手术。这样的逻辑不对吗？求大神指导~谢谢~··