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': 'Progressive multifocal leukoencephalopathy is caused by - \nSelect and explain. \nA. CMV, B. EBV, C. JC virus, D. RSV', 'role': 'user'}, {'content': 'Answer: C \nExplanation: PMK is caused by JCV (belings to polyoma viruses) REF:ANATHANARAYANAN MICROBIOLOGY NINTH EDITION PAGE.554', 'role': 'assistant'}]