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
The width of bracket most commonly used are: 
Select and explain. 
A. 0.017 and 0.021, B. 0.014 and 0.024, C. 0.018 and 0.028, D. 0.010 and 0.020
C: 0.018 and 0.028
Answer: C: 0.018 and 0.028 
Explanation: None