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': "Specificity of a screening test measures aEUR' \nSelect and explain. \nA. True positives, B. False positives, C. False negatives, D. True negatives", 'role': 'user'}, {'content': "Answer: D \nExplanation: True negatives Repeat from May 06 Sensitivity is the ability of test to identify correctly all those who have the disease, i.e, 'true positives'. Specificity is the ability of a test to identify correctly those who do not have the disease, i.e. 'true negatives'.", 'role': 'assistant'}]