单选题患者吴某，肝硬化合并上消化道出血，经对症治疗后出血停止，病情好转。此患者需做大便潜血试验，前3天应禁食（）A白菜B牛奶C土豆D冬瓜E羊血
单选题
患者吴某，肝硬化合并上消化道出血，经对症治疗后出血停止，病情好转。此患者需做大便潜血试验，前3天应禁食（）
A
白菜
B
牛奶
C
土豆
D
冬瓜
E
羊血
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