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【单选题】
患者，男性，60岁，患充血性心力衰竭，采用利尿药治疗。药物A和B具有相同的利尿机制。5mg药物A与500mg药物B能够产生相同的利尿强度，这提示（）A.
药物B的效能低于药物A
B.
药物A比药物B的效价强度强
C.
药物A的毒性比药物B低
D.
药物A比药物B更安全
E.
药物A的作用时药物B短
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皮皮学刷刷变学霸
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