题目内容：
引起机械性肠梗阻最常见的原因是
A．粪块 B．肿瘤
C．术后肠粘连
D．炎症性肠病
E．蛔虫
参考答案：
答案解析：
单选题：引起机械性肠梗阻最常见的原因是
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B．肿瘤
C．术后肠粘连
D．炎症性肠病
E．蛔虫
B．肿瘤
C．术后肠粘连
D．炎症性肠病
E．蛔虫
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