This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Screening, Subject name: Social & Preventive Medicine
[{'content': 'Specificity measures- \nSelect and explain. \nA. True negative, B. False positives, C. True positives, D. None of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ref :Parks 23rd edition pg 139 Specificity = TN / (TN + FP) Specificity is defined as the ability of a test to identify correctly all those who do not have the disease, that is "true negatives".', 'role': 'assistant'}]