This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Dental
[{'content': 'Best way to plot the changes of incidence of disease over time is: \nSelect and explain. \nA. Histogram, B. Line chart, C. Scatter diagram., D. Ogive.', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]