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: Pediatrics
13 year old female having sudden onset high grade fever with delirium. CT. finding s/o involvement of limbic system & medial temporal lobe - Dx is 
Select and explain. 
A. Subarachnoid hemorrhage, B. Herpes simplex encephalitis, C. Pyomeningitis, D. Cerebral malaria
B: Herpes simplex encephalitis
Answer: B: Herpes simplex encephalitis 
Explanation: Ans. is 'b' i.e., Herpes simplex encephalitis Herpes simplex encephalitis Acute necrotising infection involving frontal, temporal lobe & limbic system. Feature Non specific - fever, headache, nuchal rigidity. convulsion, altered sensorium. Confirmed by CSF examin & radio imaging. Treatment suppoive and Acyclovir