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【单选题】
关于避孕药的描述，下列不正确的是A.
避孕药的成分是人工合成的甾体激素
B.
左炔诺孕酮属于孕酮衍生物
C.
女用避孕药多数是雌孕激素复合制剂
D.
口服避孕药分为长效和短效
E.
紧急避孕药有激素类和非激素类两类
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