Encephalitis is caused by :: (A) HSV-I, (B) EBV, (C) Infectious mononucleosis, (D) CMV
Answer is A. Infections caused by HSV-1

Acute gingivo-stomatitis
Herpes labialis
Kerato-conjuctivitis 
Eczema herpeticum
Encephalitis
Dendritic keratitis

Ref : textbook of microbiology, C P Baveja, 5th edition , Pg no:444