单选题:关于原发性痛经,下列正确的是( )

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题目内容:
关于原发性痛经,下列正确的是( ) A.18岁仍无月经来潮者
B.16岁仍无月经来潮者
C.曾建立规律月经后停经6个月者
D.无任何诱因连续2个月停经者
E.13岁月经来潮者
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