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
[{'content': 'Mobility of teeth in carcinoma of Maxillary sinus is due to involvement by tumor of \nSelect and explain. \nA. Anterior wall of the sinus, B. Posterior wall of the sinus, C. Roof of the sinus, D. Floor of the sinus', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]