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': 'Which of the following symptoms are related to\nmaxillary sinusitis \nSelect and explain. \nA. Tenderness over the involved area, B. Post nasal drip, C. Change in phonation, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]