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
All of the following are true about H-files EXCEPT 
Select and explain. 
A. They have good cutting efficiency, B. They are fragile and tend to break easily, C. They are used in torquing action, D. They have more positive rake angle
C: They are used in torquing action
Answer: C: They are used in torquing action 
Explanation: None