单选题:表面灰黄色或黄褐色,有不规则结节状逢起,有的节间表面平滑如茎秆,习称“过桥”的药材是(  )。

题目内容:
表面灰黄色或黄褐色,有不规则结节状逢起,有的节间表面平滑如茎秆,习称“过桥”的药材是(  )。 A.桔梗
B.羌活
C.黄连
D.玉竹
E.巴戟天
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