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 of a screening test measures \nSelect and explain. \nA. True positive, B. False positive, C. True Negative, D. False Negative', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]