This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Virology, Subject name: Microbiology
[{'content': 'Mad Cow disease (Spongiform disease) occurs due to - \nSelect and explain. \nA. CJ virus, B. Arena virus, C. Kuru virus, D. Parvo virus', 'role': 'user'}, {'content': "Answer: A \nExplanation: prion disease in animals include scrapie,mink encephalopathy,BSE madcow disease.These are caused by slow virus group B. REF:ANANTHANARAYAN AND PANIKER'S TEXTBOOK OF MICROBIOLOGY 9TH EDITION PAGE NO:556,557", 'role': 'assistant'}]