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
The commonest site of extramedullary relapse of ALL – 
Select and explain. 
A. CNS, B. Lung, C. Liver, D. Testis
A: CNS
Answer: A: CNS 
Explanation: The common site of relapse of ALL → i) Bone marrow (most common - 20%), ii) CNS (5%)  iii) Testis (3%)