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
The adult maxillary air sinus always lies directly above the following teeth: 
Select and explain. 
A. Incisors, B. Incisors and canine, C. Premolars, D. Molars
D: Molars
Answer: D: Molars 
Explanation: None