This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Head and neck, Subject name: Surgery
[{'content': 'Most common tumor to metastasize to brain is: \nSelect and explain. \nA. Breast, B. Melanoma, C. Lung, D. Prostate', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Common malignancies metastasizing to brain: Lung > Breast > Melanoma Brain metastases are the most common brain tumors; they are three times more common than all primary brain tumors combined. Ref : Harrison 18/e p3390', 'role': 'assistant'}]