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
Difference between physical characteristic of reamers and files is: 
Select and explain. 
A. The cross-section of reamers in square and files are triangular in cross-section, B. The number of flutes on the blade are more in files than in reamers, C. The reamers have more flutes in the blade, D. Files have two superficial grooves to produce flutes in a double helix design
B: The number of flutes on the blade are more in files than in reamers
Answer: B: The number of flutes on the blade are more in files than in reamers 
Explanation: None