题目内容

一项对某高校教员的健康普查表明，80%的胃溃疡患者都有夜间工作的习惯。因此，夜间工作易造成的植物神经功能紊乱是诱发胃溃疡的重要原因。以下哪项，如果是真的，将严重削弱上述论证

A. 医学研究尚不能揭示消化系统的疾病和神经系统的内在联系。
B. 该校的胃溃疡患者主要集中在中老年教师中。
C. 该校的胃溃疡患者近年来有上升的趋势。
D. 该校教员中只有近五分之一的教员没有夜间工作的习惯。
E. 该校胃溃疡患者中近60%患有不同程度的失眠症。

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