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
Occlusal view of the following tooth is triangular: 
Select and explain. 
A. Maxillary central incisor, B. Mandibular central incisor, C. Mandibular lateral incisor, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: None