Which procedure is used to examine the colon visually?

• A. Bronchoscopy
• B. Colonoscopy
• C. Bone scan
• D. Calcium test

Answer: (B)

Colonoscopy is the procedure used to examine the colon visually. It uses a flexible scope inserted through the rectum to view the entire colon lining directly, allowing detection of polyps, cancers, ulcers, or inflammation, and enabling biopsies or removal of polyps during the same procedure. Bronchoscopy looks at the lungs’ airways, a bone scan images bones with a radioactive tracer, and a calcium test measures calcium in the blood or urine—none provides a direct visual survey of the colon.