袢利尿剂主要作用于髓袢升支粗段，利尿作用强，其代表药物是（）。
A.布美他尼
B.呋塞米
C.依他尼酸
D.托拉塞米
E.氢氯噻嗪
参考答案：B
解析：本题考查要点是“袢利尿剂的代表药物”。袢利尿剂的代表药物是呋塞米。其他药物如布美他尼、依他尼酸、托拉塞米等的作用部位、机制以及对电解质的影响虽与呋塞米相似，但在利尿作用的效能和过敏反应发生率上，它们之间存在差别。所以，选项B符合题意。选项E的“氢氯噻嗪”属于噻嗪类利尿剂。因此，本题的正确答案为B。
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