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 one of the following is not a normal anatomical feature of mandibular incisors? 
Select and explain. 
A. Bifurcated roots., B. Inconspicuous cingula., C. Four developmental lobes., D. Incisal edges placed slightly lingually.
A: Bifurcated roots.
Answer: A: Bifurcated roots. 
Explanation: Bifurcated roots are not a normal feature of mandibular incisors.