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': 'Graphical representation of frequency distribution curve is \nSelect and explain. \nA. Pie cha, B. Bar diagram, C. Histogram, D. Pictogram', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ref:Park's Textbook of Preventive and Social Medicine 25th Ed", 'role': 'assistant'}]