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 tooth most commonly having bifurcated roots is the: 
Select and explain. 
A. Maxillary central incisor, B. Mandibular lateral incisor, C. Mand. central incisor, D. Mandibular premolar
D: Mandibular premolar
Answer: D: Mandibular premolar 
Explanation: None