Which of the following most logically completes the passage?

Appendicitis (inflammation of the appendix) is potentially fatal; consequently, patients with symptoms strongly suggesting appendicitis almost always have their appendix removed. The appropriate surgery is low-risk but performed unnecessarily in about 20 percent of all cases. A newly developed internal scan for appendicitis is highly accurate, producing two misdiagnoses for every 98 correcgt diagnoses. Clearly, using this test, doctors can largely avoid unnecessary removals of the appendix without, however, performing any fewer necessary ones than before, since______.

A. the patients who are correctly diagnosed with this test as not having appendictis invariably have medical conditions that are much less serious than appendicitis.

B.the misdiagnoses produced by this test are always instances of attributing appendicites to someone who does not, in fact , have it.

C.all of the patients who are diagnosed with this test as having appendicitis do, in fact, have appendicitis.

D. every patient who is diagnosed with this test as having appendictis has more than one of the symptoms generally associated with appendicitis.

E. the only patients who are misdiagnosed using this thest are patients who lack one more of the symptoms that are generally associated with appendicitis.

B is the key offered by feifei, but i am really confused about whether B or C is the right answer. Lawyer 你在么？

也欢迎大家一起来讨论

当然是B啦，文章说那种scan是producing two misdiagnoses for every 98 correcgt diagnoses，后面又说， without, however, performing any fewer necessary ones than before。那就是说misdiagnoses只会把没有的查成有，而不会把有的查成没有。

C根本没有谈误诊，肯定是错的。