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 common site of glomangioma is \nSelect and explain. \nA. Head & neck, B. Chest wall, C. Nail bed, D. Retroperitoneal', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]