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当前学科：临床执业医师
题目：
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患者男，40岁。胸痛、反酸、胃灼热、嗳气，多于餐后加重2个月。胃镜检查食管黏膜未见明显异常。最有助于明确诊断的检查是（）
A
上消化道气钡双重造影
B
C脲酶呼气试验
C
24小时胃食管pH监测
D
腹部B超
E
24小时心电监测
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