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
[{'content': 'The commonest site of extramedullary relapse of ALL – \nSelect and explain. \nA. CNS, B. Lung, C. Liver, D. Testis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The common site of relapse of ALL → i) Bone marrow (most common - 20%), ii) CNS (5%)\xa0\xa0iii) Testis (3%)', 'role': 'assistant'}]