<prompt> In which of the following disease, the overall survival is increased by screening procedure?Prostate cancerLung cancerColon cancerOvarian cancer  <response>: Randomized controlled trials of faecal occult blood screening for carcinoma colon have shown a reduced number of deaths by 15-33 in the screened group i.e. increased survival by 15-33. Ref: Kirks Manual of Clinical Surgery, Pages 424-426; Harrisons Internal Medicine, 16th Edition, Page 26 