This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Data Variables, Subject name: Social & Preventive Medicine
Method to represent qualitative data - 
Select and explain. 
A. Histogram, B. Comulative frequency curve, C. Frequency polygon, D. Bar Chart
D: Bar Chart
Answer: D: Bar Chart 
Explanation: Ans. is 'd' i.e., Bar Chart DataScaleGraph/DiagramQuantitativeInterval scale Ratio scaleHistogram Frequency polygon frequency curves line chart scatter diagram Cumulative frequency Curve Line Chart graphQualitativeNominal scale Ordinal scaleBar diagram Pie chart PictogramMap diagram or spot map