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
Encephalitis is caused by - 
Select and explain. 
A. HSV-1, B. EBV, C. Infectious mononucleosis, D. CMV
A: HSV-1
Answer: A: HSV-1 
Explanation: HSV encephalitis is the most common sporadic acute viral encephalitis in most part of the world