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': 'Kappa statistics is used to measure \nSelect and explain. \nA. Inter examiner validity, B. Correlation, C. Regression, D. Proportion', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]