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
[{'content': 'Best cha to represent incidence of disease over a period of time \nSelect and explain. \nA. Bar cha, B. Scatter plot, C. Line diagram, D. Histogram', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Line diagram:- Trend of a event over a period of time and scatter plot relationship between two quantitative variables Ref:- K Park, 24th ed; pg num:- 883', 'role': 'assistant'}]