This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Central Nervous System, Subject name: Pathology
[{'content': 'Most common cerebellar tumor in children? \nSelect and explain. \nA. Astrocytoma, B. Medulloblastoma, C. Ependymoma, D. PNET', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) Astrocytoma(Ref: Robbins 9th/pg 1306: See Ans 69)*Most common pediatric brain tumor-Pilocytic astrocytoma*Most aggressive pediatric brain tumor-Medulloblastoma', 'role': 'assistant'}]