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
Tooth with smallest root 
Select and explain. 
A. Mandibular central incisor, B. Mandibular lateral incisor, C. Maxillary lateral incisor, D. Maxillary 1st premolar
A: Mandibular central incisor
Answer: A: Mandibular central incisor 
Explanation: None