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': 'Which of the following is the best method of validity? \nSelect and explain. \nA. Content validity, B. Criterion validity, C. Consensual validity, D. Discriminant validity', 'role': 'user'}, {'content': 'Answer: B \nExplanation: 1. Content validity: Measurement of all variable components.\n2.\xa0Consensual validity: If no. of experts agree to a parameter.\n3.\xa0Criterion validity: If compared with a reference or gold standard.\n\nIt is the best measure of validity.\nUsually expressed as sensitivity & specificity.\xa0\n\n4. Discriminant validity: If not showing a strong correlation between 2 variables.', 'role': 'assistant'}]