题目内容：
引起柏油样便最常见的疾病是
A 直肠癌 B 肠结核 C 十二指肠溃疡 D 结膜炎 E 胆囊炎
参考答案：
选择题：引起柏油样便最常见的疾病是A 直肠癌 B 肠结核 C 十二指肠溃疡 D 结膜炎 E 胆囊炎
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