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': 'Which is the most common childhood CNS tumor metastasize outside brain? \nSelect and explain. \nA. Ependymoma, B. Glioblastoma multiforme, C. Choroid plexus tumor, D. Medulloblastoma', 'role': 'user'}, {'content': 'Answer: D \nExplanation: "Medulloblastoma is the childhood brain tumor that most commonly metastasizes extraneuronally."- Nelson \nAlso know\nThere are age-related differences in primary location of tumor.', 'role': 'assistant'}]