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: Unknown
[{'content': 'Which virus families has double stranded DNA in four different isomers? \nSelect and explain. \nA. Poxviruses, B. Herpesviruses, C. Rabiesviruses, D. Orthomyxoviruses', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]