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': 'Sensitivity measures: \nSelect and explain. \nA. True negative, B. True positive, C. False positive, D. False negative', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Sensitivity measures true positive cases.\n"The term sensitivity was introduced as a statistical index of diagnostic accuracy.\nIt has been defined as the ability of a test to identify correctly all those who have the disease, that is \'true positive\'.”', 'role': 'assistant'}]