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[单选题]
引起牛疯牛病（BSE)的病原是（)。
A.类病毒(viroid)
B.拟病毒(virusoids)
C.朊病毒(prion)
D.噬菌体(phage)
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题目内容
（请给出正确答案）
A.类病毒(viroid)
B.拟病毒(virusoids)
C.朊病毒(prion)
D.噬菌体(phage)
答案
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