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': 'Trends can be represented by- \nSelect and explain. \nA. Line diagram, B. Bar cha, C. Histogram, D. Pie cha', 'role': 'user'}, {'content': "Answer: A \nExplanation: - line diagrams are used to show the trend of events with the passage of time. Reference : Park's textbook of preventive and social medicine, 23rd edition, pg no:846", 'role': 'assistant'}]