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: Social & Preventive Medicine
[{'content': 'All of the following show relationship between two variables except? \nSelect and explain. \nA. Correlation coefficient, B. Scatter diagram, C. Dot diagram, D. Line diagram', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]