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
Round tapered blank of Stainless steel is used and multiaxis grinding process is done for following 
Select and explain. 
A. K file, B. Reamer, C. Hedstroem File, D. All of the above
C: Hedstroem File
Answer: C: Hedstroem File 
Explanation: None