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 correct diagnoses. Clearly, using this test, doctors can largely avoid unnecessary removals of the appendix without, however, performing any fewer necessary ones than before, since ______.
Clearly, using this test, doctors can largely avoid unnecessary removals of the appendix without, however, performing any fewer necessary ones than before, since ______. 原文结论是使用这个test可以减少不必要的阑尾切除，同时不减少必要的阑尾切除
A：提及阑尾以外的病，与结论无关。
B：正确。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。
C：正确诊断的人的确有阑尾炎，无关。
D：结论谈比例，这里说症状，无关。
E： 误诊是有病诊断没病，还是没病当有病？
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