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 commonest extradural spinal tumour is ? \nSelect and explain. \nA. Neurofibroma, B. Glioma, C. Meningioma, D. Metastasis', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Metastasis", 'role': 'assistant'}]