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: Medicine
[{'content': 'Which of the following viruses is not a common cause of viral encephalitis - \nSelect and explain. \nA. Herpes simplex virus type 2, B. Japanese encephalitis virus, C. Nipah virus, D. Cytomegalovirus', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]