This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Microbiology
[{'content': 'Oncogenic RNA virus is ? \nSelect and explain. \nA. An leukosis virus, B. Herpesvirus, C. Adenovirus, D. Togavirus', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e. An leukosis virus", 'role': 'assistant'}]