单项选择题

某药材呈扁圆形或扁椭圆形，表面紫红色或紫褐色，平滑有光泽，一面较平坦，中间有1条隆起的纵线纹，另一面凸起，气微，味淡。此药材是（） A.
川楝子 B.
酸枣仁 C.
理枣仁 D.
枳椇子

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