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 number on the handle of a root canal instrument denotes 
Select and explain. 
A. Length of the instrument in 1/10 of a millimetre, B. Length of the instrument in millimetres, C. Diameter at the tip in 1/100 of a millimetre, D. Diameter at the tip in 1/10 of a millimeter
C: Diameter at the tip in 1/100 of a millimetre
Answer: C: Diameter at the tip in 1/100 of a millimetre 
Explanation: None