单选题:现行版《中国药典》规定,含叶量不得少于20%的药材是(  )。

题目内容:
现行版《中国药典》规定,含叶量不得少于20%的药材是(  )。 A.广藿香
B.麻黄
C.薄荷
D.穿心莲
E.广金钱草
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