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: Pathology
[{'content': 'Most common brain tumor in adults? \nSelect and explain. \nA. Glioma, B. Metastases, C. Meningioma, D. Astrocytoma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Metastases is the most common type of brain tumor id adults.\nMost common primary for\xa0Metastases is lung.', 'role': 'assistant'}]