<prompt> In which of the following disease, Screening procedure increases the overall survival maximum?Prostate cancerLung cancerColon cancerOvarian cancer  <response>: Colonic cancer has highest 5-year survival rate post-screening. - This can be known by Kaplan meiyer survival analysis. - Screening of colonic cancer is done by colonoscopy. SCREENING TESTS OF OTHER OPTIONS: - Prostate cancer : Prostate specific antigen DRE - Lung cancer : Chest x-ray - Ovarian cancer: transvaginal ultrasound TVUS CA-125 blood test. 