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
Which of the following permanent teeth is most difficult to distinguish from mesial and distal aspects: 
Select and explain. 
A. Mandibular central incisor., B. Mandibular lateral incisor., C. Maxillary central incisor., D. Maxillary lateral incisor.
A: Mandibular central incisor.
Answer: A: Mandibular central incisor. 
Explanation: Mandibular central incisor is bilaterally symmetrical when viewed labially and incisally.