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': 'The CNS tumor present with calcification ? \nSelect and explain. \nA. Oligodendroglioma, B. Astrocytoma, C. Medulloblastoma, D. Pheochromocytoma', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' Oligodendroglioma Although many intracranial tumors show calcification, oligodendroglioma shows calcification in 70-90% of cases.", 'role': 'assistant'}]