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 of a test means, all except- \nSelect and explain. \nA. Identifies those without disease, B. True positive, C. True negative, D. An ideal screening test should have 100% specificity', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ref: Parks 23rd edition pg 139 Specificity is defined as the ability of a test to identify those who do not have the disease, that is "true negatives". Ideal screening test should have been 100% specificity.', 'role': 'assistant'}]