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: ENT
[{'content': 'Trotters triad is seen in carcinoma of - \nSelect and explain. \nA. Maxilla, B. Larynx, C. Nasopharynx, D. Ethmoid sinus', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]