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
Most common extracutaneous site of involvement in varicella infection? 
Select and explain. 
A. Heart, B. Lungs, C. Liver, D. CNS
D: CNS
Answer: D: CNS 
Explanation: M/C extracutaneous complication is CNS involvement (cerebellar ataxia, encaphalits, aseptic meningitis).