This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Variables, Scales, Subject name: Social & Preventive Medicine
An old man with hypeension and BP 210/110 mm Hg is classified into Severe hypeension. Scale used is 
Select and explain. 
A. Nominal, B. Ordinal, C. Interval, D. Ration
B: Ordinal
Answer: B: Ordinal 
Explanation: ORDINAL SCALEScale on which data is shown simply in order of magnitude, since there is no standard of measurement of differences - Categories are organized as a continuum - In the given question, If BP is measured as absolute quantified numbers (E.g. BP 210/110), it should be measured on Metric scale If BP is categorized as Mild-Moderate-Severe, it will become Ordinal scale