<human>: I've heard that I should get a colonoscopy. Why?
<bot>: A colonoscopy is a test that uses a camera to examine the inside of your colon. It's used to screen for colorectal cancer and other diseases. The test involves inserting a thin tube into the rectum, which then moves through the colon and up to the throat. The tube allows doctors to look at the lining of the colon and remove any abnormal tissue.