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: Social & Preventive Medicine
If the grading of diabetes is classified as mild, moderate and severe the scale of measurement used is: 
Select and explain. 
A. Interval, B. Nominal, C. Ordinal, D. Ratio
C: Ordinal
Answer: C: Ordinal 
Explanation: Ordinal