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': 'Ideal screening test should be \nSelect and explain. \nA. Safe, B. Reliable, C. Valid, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The criteria for screening are based on two consideration :\n\nDisease to be screened, and\nScreening test to be applied.\n\nA) Disease to be screened\n\nThe disease should be an important health problem with a recognizable latent or asymptomatic stage.\nThere should be a test (screening test) which can detect the disease prior to clinical stage, with also availability of a diagnostic (confirmatory) test.\nThere should be an effective treatment which should reduce morbidity and mortality if started early. B) Screening test to be applied\nThe screening test to be applied should fulfil following criteria 1) Acceptibility\n\nThe test should be acceptable to the people whom it is aimed. 2) Repeatability (reliability)\nThe test must give consistent results when it is repeated more than once on the same individual under same condition, i.e. results of test must by precise (exact).\nThus, repeatability is also known as precision, reliability or reproducibility. 3) Validity (accuracy)\nIt refers to what extent the test accurately measures which is purports to measure.\nValidity has two componens : i) Sensitivity ii) Specificity.\nA test should have high sensitivity and specificity', 'role': 'assistant'}]