400-600-1123
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答案：
E
内科医生：
合成的褪黑激素作为一种治疗睡眠失调的药物很有前景。但是由于它的长期副作用现在还未知所以我不推荐当前使用。
病人：你的立场和你的行为不符，你开了很多你知道具有严重副作用的药物，所以对副作用的担忧并不是你不开褪黑激素的真正原因。
问题：病人的反驳在逻辑上是有问题的，因为它没有考虑到下面哪一项？
分析：割裂逻辑关系型的负向逻辑，我们可以清楚地看出医生对M激素不推荐的原因是因为SIDE EFFECT UNKNOWN,而病人指责医生的论据里用的是KNOWN SIDE EFFECT，这很明显是混淆了已知和未知两个逻辑概念。这个逻辑错误是非常明显的，选项E说已知风险可以与已知益处进行权衡，而未知的风险则不行，是我们要找的答案。 
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