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
Instrument having Shank with alternating cutting edges 
Select and explain. 
A. Real world endo, B. Endotech endo. instrument, C. RACE, D. K-6
C: RACE
Answer: C: RACE 
Explanation: None