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: Surgery
[{'content': 'Most common abdominal tumor in children is \nSelect and explain. \nA. Neuroblastoma, B. Wilms tumor, C. RCC, D. Teratoma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: MCC of abdominal tumor in children is neuroblastoma. It crosses midline\n2nd MCC of abdominal tumor in children is wilms tumor it doesnt cross midline', 'role': 'assistant'}]