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': 'Dengue virus is a: \nSelect and explain. \nA. Aplha virus, B. Flavi virus, C. Reovirus, D. Bunya virus', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Flavi virus', 'role': 'assistant'}]