题目内容

该研究的正确结论是

A. 病例组口腔癌患病率明显高于对照组
B. 病例组发生口腔癌的可能性明显高于对照组
C. 不吸烟者发生口腔癌的可能性明显低于吸烟者
D. 对照组发生口腔癌的可能性明显高于病例组
E. 对照组口腔癌患病率明显高于病例组

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