This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Microbiology
[{'content': "The usefulness of a 'screening test' in a community depends on its \nSelect and explain. \nA. Sensitivity, B. Specificity, C. Reliability, D. Predicitive value", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Predictive value of a test signifies the diagnostic power of the test.An attribute of an idea screening test is its repeatability or reliability or reproducibility.Sensitivity has been defined as the ability of the test to identify correctly all those who have the disease, that is truly positive (Hence determines the usefulness of the screening test).Specificity is not as impoant. After screening, we can apply a confirmatory test with high specificity.', 'role': 'assistant'}]