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
Which of the following symptoms are related to
maxillary sinusitis 
Select and explain. 
A. Tenderness over the involved area, B. Post nasal drip, C. Change in phonation, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: None