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
Progressive multifocal leukoencephalopathy is caused by - 
Select and explain. 
A. CMV, B. EBV, C. JC virus, D. RSV
C: JC virus
Answer: C: JC virus 
Explanation: PMK is caused by JCV (belings to polyoma viruses) REF:ANATHANARAYANAN MICROBIOLOGY NINTH EDITION PAGE.554