下列属于继发性不孕的情况是（）
A.育龄妇女，未避孕，婚后性生活正常，未避孕，同居2年未孕者
B.育龄妇女，婚后性生活正常，未避孕，同居1年未孕者
C.夫妇同居，性生活正常，曾有自然流产一次，未避孕，2年未孕者
D.夫妇同居，性生活正常，曾有自然流产一次，后未避孕，1年未孕者
E.夫妇同居后1年未孕，一方有无法纠正的解剖生理缺陷者
参考答案：C
解析：不孕症的定义：凡婚后未避孕、有正常性生活、同居2年而未受孕者，称为原发性不孕。曾有过妊娠而后未避孕，连续2年不孕者称继发性不孕。
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