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
To prevent the fracture of an endodontic instrument the number of turns given inside the canal in a single motion should be: 
Select and explain. 
A. Less than ¼ of a turn, B. ¼ to ½ turn, C. ½ of a turn, D. More than ¾
B: ¼ to ½ turn
Answer: B: ¼ to ½ turn 
Explanation: None