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: Medicine
[{'content': 'Which of the following intracranial tumors has the best prognosis? \nSelect and explain. \nA. Glioblastoma, B. Cerebellar astrocytoma, C. Medulloblastoma, D. Ependymoma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Cerebellar astrocytoma is the most common type of posterior fossa tumor in childhood and has an excellent prognosis following surgical removal. Next to cerebellar astrocytoma, medulloblastoma is the most frequent tumor involving posterior cranial fossa structures and has a poor prognosis for recovery.', 'role': 'assistant'}]