List of top Community Science Questions on Screening test validity

In a screening test for diabetes mellitus, out of 1000 population, 90 were positive. The gold standard test was then done, in which 100 were positive. Calculate the sensitivity.

A graph of a normal blood sugar level curve and a diabetic blood sugar level curve was shown, with an area seen overlapping towards the normal glycaemic curve and a cut-off point marked at 120 mg/dL. What does that overlapping area represent?