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': 'Most common oncogenic RNA virus - \nSelect and explain. \nA. Retrovirus, B. Picornavirus, C. Ohomyxovirus, D. Paramyxovirus', 'role': 'user'}, {'content': 'Answer: A \nExplanation: only oncogenic RNA viruses retetro viruses REF:MICROBIOLOGY ANANTHA NARAYANAN NINTH EDITION PAGE.565', 'role': 'assistant'}]