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【单选题】
发病率可以表示为：
A.
(观察期内的新病例数÷同期暴露人数)×100%
B.
(观察期内的新病例数÷同期平均人数)×100%
C.
(观察期内的旧病例数÷同期暴露人)
D.
(观察期内的新旧病例数÷同期平均人数)×100%
E.
(观察期内的新旧病例数÷同期暴露人数)×100%
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