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 average width of enamel rods is 
Select and explain. 
A. 10 microns, B. 5 microns, C. 2 microns, D. 0.5 microns
B: 5 microns
Answer: B: 5 microns 
Explanation: None