An examination of the anus and rectum is a:

A) sigmoidoscopy.
B) gastroscopy.
C) colonoscopy.
D) proctoscopy.

Sigmoidoscopy

A medical examination of the sigmoid colon by means of a flexible tube inserted through the anus to check for cancer, polyps, and other anomalies.

Gastroscopy

A diagnostic procedure that involves using a gastroscope to visually examine the interior of the stomach.

Colonoscopy

A medical procedure using a camera to examine the interior lining of the colon and rectum.