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 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: Specificity is the ability to identify correctly who do not have disease i.e., true negative.\nThe ability to identify correctly all those having a disease, i.e., true positive is known as sensitivity.\nAn ideal test should be 100% sensitive & 100% specific.', 'role': 'assistant'}]