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': 'A deep-seated carcinoma in the neck near the bifurcation of the common carotid artery with no evidence of primary carcinoma of the mouth, pharynx, larynx is \nSelect and explain. \nA. Collar stud abscess., B. Branchiogenic carcinoma., C. Subhyoid bursal cyst., D. Cold abscess.', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]