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【单选题】
队列研究中研究对象应选择A.
在患某病者中选择有、无某暴露因素的两个组
B.
在患该病者中选择有某暴露因素的为一组,在无该病者中选择无该暴露因素的为另一组
C.
在无该病者中选择有某暴露因素的为一组,在有该病者中选择无该暴露因素的为另一组
D.
在无该病者中,选择有、无某暴露因素的两个组
E.
任选有无暴露的两个组
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