This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neoplastic disorders of WBCs, Subject name: Pediatrics
[{'content': 'Commonest childhood tumor is: \nSelect and explain. \nA. Acute lymphoblastic leukemia, B. Chronic lymphoblastic leukemia, C. Chronic myeloid leukemia, D. Brain tumor', 'role': 'user'}, {'content': "Answer: A \nExplanation: Common Childhood Tumors are: Leukemia (ALL) > Brain tumors > Lymphoma > Neuroblastoma > Wilm's tumor. High yield points about childhood tumors: * Most common childhood leukemia is ALL * Most common tumor in infancy is Neuroblastoma * Most common solid tumor of childhood is Brain tumor * Most common intra-abdominal & extra-cranial solid tumor in childhood is Neuroblastoma * MC primary intra ocular tumor in children is RETINOBLASTOMA * MC primary renal tumor of childhood - WILM'S TUMOR", 'role': 'assistant'}]