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
Commonest site of extramedullary relapse of 
Select and explain. 
A. CNS, B. Lung, C. Liver, D. Testis
A: CNS
Answer: A: CNS 
Explanation: Ans. is 'a' i.e., CNS