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
Displacement of a root into the maxillary sinus
during extraction is most likely to happen during the extraction of the maxillary 
Select and explain. 
A. Canine, B. Deciduous first molar, C. First molar, D. Second molar
C: First molar
Answer: C: First molar 
Explanation: None