This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
[{'content': 'In which of the following disease, the overall survival is increased by screening procedure? \nSelect and explain. \nA. Prostate cancer, B. Lung cancer, C. Colon cancer, D. Ovarian cancer', 'role': 'user'}, {'content': "Answer: C \nExplanation: 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: Kirk's Manual of Clinical Surgery, Pages 424-426; Harrison's Internal Medicine, 16th Edition, Page 26", 'role': 'assistant'}]