This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Biostatistics, Subject name: Social & Preventive Medicine
Variables in the form of mild,moderate,severe is given.Method used to analyse is 
Select and explain. 
A. Nominal, B. Ordinal, C. Interval, D. Variance
B: Ordinal
Answer: B: Ordinal 
Explanation: Ref:Park's Textbook of Preventive and Social Medicine 25th Ed