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: Dental
The most easily perforated tooth with a slight mesial or distal angulation of bur after a mandibular central incisor is: 
Select and explain. 
A. Maxillary premolar, B. Maxillary molar, C. Mandibular premolar, D. Maxillary canine
A: Maxillary premolar
Answer: A: Maxillary premolar 
Explanation: None