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
Interval variable have all propeies except:- 
Select and explain. 
A. Identity, B. Magnitude, C. Propey of equidistance, D. True zero
D: True zero
Answer: D: True zero 
Explanation: Identity Different numerals display different classification Nominal, Ordinal,Interval, Ratio Magnitude Different numerals display different identity and magnitude Ordinal, Interval, Ratio Interval Numerals are meaningful and display propey of Equidistance Interval, Ratio True zero Represent the absence of an attribute Ratio - Thus, option-4 is the answer.