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': 'S file, False is \nSelect and explain. \nA. Can also be called as Unifile, B. Has double helical design, C. Increased cutting efficiency than H file, D. Increased fracture resistance than H file', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]