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
On a carbide bur, a great number of cutting blades results in: 
Select and explain. 
A. Less efficient cutting and a smoother surface, B. Less efficient cutting and a rougher surface, C. More efficient cutting and a smoother surface, D. More efficient cutting and a rougher surface
A: Less efficient cutting and a smoother surface
Answer: A: Less efficient cutting and a smoother surface 
Explanation: None