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
Listing conditions in some order of severity without attempting to define any mathematical relation between categories is 
Select and explain. 
A. Nominal scale, B. Ordinal scale, C. Interval scale, D. Ratio scale
B: Ordinal scale
Answer: B: Ordinal scale 
Explanation: None