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': "The usefulness of a 'screening test' in a community depends on its: \nSelect and explain. \nA. Sensitivity, B. Specificity, C. Reliability, D. Predictive value", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Sensitivity', 'role': 'assistant'}]