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
Mad cow disease is due to - 
Select and explain. 
A. Slow virus, B. Mycoplasma, C. Bacteria, D. F ungus
A: Slow virus
Answer: A: Slow virus 
Explanation: slow virus groupB causes mad cow disease REF:ANATHANARAYANAN MICROBIOLOGY NINTH EDITION PAGE.557