问题
单项选择题
在分子流行病学研究中，暴露标志和效应标志是结合疾病的阶段和研究需要确定的；根据研究目的不同，大多情况下，一项生物标志。（）
A、作为暴露标志就不能作为效应标志
B、作为效应标志就不能作为暴露标志
C、有时作为效应标志，有时也作为暴露标志
D、可以同时既是暴露标志又是效应标志
E、只宜作为暴露标志
答案
参考答案：C
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在分子流行病学研究中，暴露标志和效应标志是结合疾病的阶段和研究需要确定的；根据研究目的不同，大多情况下，一项生物标志。（）
A、作为暴露标志就不能作为效应标志
B、作为效应标志就不能作为暴露标志
C、有时作为效应标志，有时也作为暴露标志
D、可以同时既是暴露标志又是效应标志
E、只宜作为暴露标志
参考答案：C
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