<prompt> Specificity of a test means, all except -Identifies those without diseaseTrue positiveTrue negativeAn ideal screening test should have 100 specificity  <response>: Specificity is the ability to identify correctly who do not have disease i.e., true negative.The ability to identify correctly all those having a disease, i.e., true positive is known as sensitivity.An ideal test should be 100 sensitive 100 specific. 