This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Leukemias and Lymphoma, Subject name: Pediatrics
[{'content': 'Most common malignancy in children is- \nSelect and explain. \nA. Acute Myeloid Leukemia, B. Acute Lymphoblastic leukemia, C. Neuroblastoma, D. Medulloblastoma', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Acute Lymphoblastic leukemiao Repeat from previous sessions.", 'role': 'assistant'}]