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
H type endodontic instrument has a spiral edge arranged to allow cutting during 
Select and explain. 
A. Pushing stroke, B. Pulling stroke, C. Circular stroke, D. Oblong stroke
B: Pulling stroke
Answer: B: Pulling stroke 
Explanation: None