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
Over filling may force materials directly in to the maxillary sinus most frequently in the case of: 
Select and explain. 
A. Maxillary second premolar, B. Maxillary first premolar, C. Maxillary first molar, D. Facial root maxillary first premolar
C: Maxillary first molar
Answer: C: Maxillary first molar 
Explanation: None