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': 'Qualitative data presentation diagrams are all except: \nSelect and explain. \nA. Pie diagram, B. Pictogram, C. Spot map, D. Frequency polygon', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Data Presentation', 'role': 'assistant'}]