单选题:根据以下材料,回答题A.百部B.石菖蒲C.知母D.莪术E.姜黄饮片切面黄绿色或棕褐色,有黄白色内皮层环纹及淡黄棕色的点状

题目内容:
根据以下材料,回答题
A.百部
B.石菖蒲
C.知母
D.莪术
E.姜黄
饮片切面黄绿色或棕褐色,有黄白色内皮层环纹及淡黄棕色的点状维管束;气微香,味微苦而辛的是
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