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': "Second most common neoplasm seen in children is- \nSelect and explain. \nA. Lymphoma, B. Brain tumour, C. Wilm's tumour, D. Neuroblastoma", 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Brain tumour", 'role': 'assistant'}]