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
[{'content': 'To prevent the fracture of an endodontic instrument the number of turns given inside the canal in a single motion should be: \nSelect and explain. \nA. Less than ¼ of a turn, B. ¼ to ½ turn, C. ½ of a turn, D. More than ¾', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]