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': 'Which of the following is the most common tumor of brain? \nSelect and explain. \nA. Glioma, B. Meningioma, C. Cerebral metastasis, D. None of the above', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Cerebral metastases are by far the most common intracranial tumours and will affect approximately one in every four cancer sufferers. They tend to occur in the fifth to seventh decades.', 'role': 'assistant'}]