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': 'Oncogenic RNA virus is - \nSelect and explain. \nA. An leukosis virus, B. Herpes virus, C. Adenovirus, D. Togavirus', 'role': 'user'}, {'content': 'Answer: A \nExplanation: only an leukosis viruse are RNA viruses(retro virus)others are DNA virus REF:MICROBIOLOGY ANANTHA NARAYANAN NINTH EDITION PAGE.565', 'role': 'assistant'}]