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
Which of the following is relatively difficult tooth
to extract 
Select and explain. 
A. Maxillary canine, B. Maxillary central incisor, C. Mandibular premolar, D. Mandibular canine
A: Maxillary canine
Answer: A: Maxillary canine 
Explanation: None