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 Single rooted tooth will most commonly have 2 root canals 
Select and explain. 
A. Upper Central incisor, B. Upper 2nd premolar, C. Lower 1st premolar, D. Lower Central incisor
B: Upper 2nd premolar
Answer: B: Upper 2nd premolar 
Explanation: None