This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Statistical Graphs, Correlation, Locations, Subject name: Social & Preventive Medicine
Number of dengue cases in Delhi 2000 - 2015 is best represented by:- 
Select and explain. 
A. Histogram, B. Line cha, C. Scatter diagram, D. Bar cha
B: Line cha
Answer: B: Line cha 
Explanation: Line Cha/Graph: Is a frequency polygon presenting variations by line. It shows the trends of an event over a period of time. No closed loop & no histogram in the background.