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
Highest incidence of atypical root canal or root among all teeth is seen in 
Select and explain. 
A. Mandibular 1st premolar, B. Mandibular canine, C. Maxillary 1stpremolar, D. Mandibular 2nd premolar
A: Mandibular 1st premolar
Answer: A: Mandibular 1st premolar 
Explanation: None