题目内容
（请给出正确答案）
临床试验中的随机化是为了保证
A．观察者间变异最小
B．试验的病人能代表该试验的目标人群
C．在试验期间对干预组和对照组的处理与评价相似
D．干预组和对照组在人口学和临床体征上相似
E．干预组和对照组在试验中能够随时换组
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