This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ohopedics Oncology, Subject name: Orthopaedics
[{'content': "Which of the following childhood tumors most frequently metastasizes to the bone? \nSelect and explain. \nA. Neuroblastoma, B. Ganglioneuroma, C. Wilms' tumor, D. Ewing's sarcoma", 'role': 'user'}, {'content': "Answer: A \nExplanation: BONE: Osteosarcoma/Neuroblastoma/Ewing's Sarcoma (Maximum incidence of a paicular tumor type). Neuroblastoma is the Most Common Tumor to have Bone Metastasis in Children", 'role': 'assistant'}]