<prompt> Denominator in sensitivity is ?Total number of healthy peopleTotal number of diseased peopleTotal number of people showing positive resultsTotal number of people showing negative results  <response>: Ans. is b i.e., Total number of diseased people i SensitivityIt is the percentage of diseased people that who are diagnosed as having disease.Total number of diseased people True positive False negative.Number of people among diseased people diagnosed as having disease True positives. ii SpecificityIt is the percentage of healthy people who are identified as healthy.Total number of healthy people True negatives False positivesNumber of healthy people who are identified as healthy True negatives 