Cause of 'Mad Cow' disease of England

The causative agent of mad - cow disease is a

The causative agent of mad-cow diesase is a

The causative agent of mad-cow diesase is a

The causative agent of mad-cow diesase is a

Cause of Surra disease in cattle is

Mad cow disease is caused by______

Mark the odd one (w.r.t. prions) (a) CFJ disease (b) Mad cow disease (c) Potato leaf roll (d) Scrapie disease