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: Pathology
Mobility of teeth in carcinoma of Maxillary sinus is due to involvement by tumor of 
Select and explain. 
A. Anterior wall of the sinus, B. Posterior wall of the sinus, C. Roof of the sinus, D. Floor of the sinus
D: Floor of the sinus
Answer: D: Floor of the sinus 
Explanation: None