This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Childhood Tumors, Subject name: Pediatrics
[{'content': "Most common intra-abdominal solid tumor in children: \nSelect and explain. \nA. Wilms' tumor(Nephroblastoma), B. Neuroblastoma, C. Rhabdomyosarcoma, D. Hodgkin lymphoma", 'role': 'user'}, {'content': "Answer: B \nExplanation: b. Neuroblastoma(Ref: Nelson's 20/e p 2461-2466, Ghai 8/e 617-618)Most common intra-abdominal solid tumor in children is Neuroblastoma, followed by Wilms' tumor.", 'role': 'assistant'}]