A colonoscopy is used to visualize which part of the body?

A colonoscopy is a medical procedure specifically designed to visualize the interior of the large intestine, also known as the colon. This procedure involves the insertion of a flexible tube equipped with a camera through the rectum, allowing healthcare providers to examine the lining of the colon for abnormalities, such as polyps, tumors, or signs of inflammation.

The large intestine includes the cecum, colon, rectum, and anal canal. While other tests and procedures may be used to visualize the small intestine and stomach, the colonoscopy is explicitly indicated for examining the large intestine only. This focused capability makes the correct answer the one that specifies the large intestine alone, highlighting the primary purpose of a colonoscopy.