单选题:白塞病的诊断标准中,必要条件是(  )

题目内容:
白塞病的诊断标准中,必要条件是(  ) A.复发性口腔溃疡,每年3次
B.复发性外阴溃疡,每年3次
C.眼炎
D.皮肤病变
E.针刺反应阳性
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