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': 'Most common CNS tumor showing calcification is : \nSelect and explain. \nA. Craniopharyngioma, B. Oligodendroglioma, C. Meningioma, D. Pilocytic astrocytoma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Brain tumors showing calcification:\nCraniopharyngioma >\xa0Oligodendroglioma > Meningioma', 'role': 'assistant'}]