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 extraction of which of the following is most
difficult in maxillary arch 
Select and explain. 
A. Lateral incisor, B. First premolar, C. Second premolar, D. Canine
B: First premolar
Answer: B: First premolar 
Explanation: None