单选题:儿童计划免疫中,通过接种卡介苗防治和控制肺结核。卡介苗对于接种的人来说属于(  )。

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题目内容:

儿童计划免疫中,通过接种卡介苗防治和控制肺结核。卡介苗对于接种的人来说属于(  )。 A.病原体
B.抗原
C.抗体
D.传染源

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