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': 'PML is caused by - \nSelect and explain. \nA. CMV, B. Papova virus, C. HIV, D. Polio virus', 'role': 'user'}, {'content': 'Answer: B \nExplanation: polyoma virus(belongs to papova viruses) causesPML REF:ANATHANARAYANAN MICROBIOLOGY NINTH EDITION PAGE.554', 'role': 'assistant'}]