Discussion
Prions have been reported to kill :
Answer: D
Prions are reported to kill humans and cattle.
Prion diseases are fatal neurodegenerative disorders caused by misfolded prion protein. In cattle the disease is bovine spongiform encephalopathy (mad cow disease); in humans it includes Creutzfeldt-Jakob disease, its variant form linked to eating BSE-infected beef, and kuru.
Since both are affected, 'humans only' and 'cattle only' are incomplete. Prion diseases also occur in sheep (scrapie) and deer, but not as a recognised disease of monkeys and poultry.
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