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
Single furcation canal is seen in what percentage of mandibular molars 
Select and explain. 
A. 13%, B. 10%, C. 23%, D. All of the above
A: 13%
Answer: A: 13% 
Explanation: There are three patterns for accessory canals in mandibular molars

Single accessory canal arises from coronal 1/3rd = 23%
Single furcation canal: 13%
Both accessory canal and Furcation canals : 10% of cases