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': "The following virus isn't enveloped virus but contains double stranded RNA \nSelect and explain. \nA. Adenovirus, B. Reovirus, C. CMV, D. Hepatitis B virus", 'role': 'user'}, {'content': "Answer: B \nExplanation: Reovirus, rotavirus and Colorado tick virus are double-stranded RNA viruses with no envelope DS RNA viruses doesn't have envelope Ref: Baveja 5th ed Pg: 423", 'role': 'assistant'}]