单选题：一女性患者，25岁，泌尿系感染用链霉素治疗3天，疗效不好，可改用下列哪种药物（　　）

题目内容：
一女性患者，25岁，泌尿系感染用链霉素治疗3天，疗效不好，可改用下列哪种药物（　　） A．红霉素
B．强力霉素
C．庆大霉素
D．环丙沙星
E．磺胺嘧啶
参考答案：
答案解析：

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