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 mesial surface of the crown is almost parallel to long axis and the root of a: 
Select and explain. 
A. Maxillary 1st premolar, B. Mandibular 2nd Premolar, C. Maxillary canine, D. Mandibular canine
D: Mandibular canine
Answer: D: Mandibular canine 
Explanation: None