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: Radiology
[{'content': 'Tumor associated with extracranial spread \nSelect and explain. \nA. Ependymoma, B. Medulloblastoma, C. Glioblastoma multiformae, D. Choroid plexus papilloma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Medulloblastoma', 'role': 'assistant'}]