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': 'Most common cause of sporadic encephalitis - \nSelect and explain. \nA. EBV, B. HSV, C. Poliovirus, D. CMV', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. is \'b\' i.e., HSV "HSV encephalitis is the most common sporadic acute viral encephalitis in most part of the world. " - Ananthnarayan', 'role': 'assistant'}]