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B
Virus
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C
Prion
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D
Mycoplasma
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Solution
The correct option is C Prion Scrapie is a fatal, degenerative disease that affects the nervous systems of sheep and goats. It is one of several transmissible spongiform encephalopathies (TSEs), which are related to bovine spongiform encephalopathy (BSE or "mad cow disease") and chronic wasting disease of deer. Like other spongiform encephalopathies, scrapie is caused by a prion. Scrapie has been known since 1732, and does not appear to be transmissible to humans. Thus, option C is correct. Scrapie is not caused by bacterium, virus and Mycoplasma.