Which instrument is specifically designed to examine the sigmoid section of the large intestine?

The sigmoidoscope is a specialized instrument specifically designed to examine the sigmoid colon, which is the S-shaped part of the large intestine located just before the rectum. This medical tool allows healthcare providers to visually inspect the interior lining of the sigmoid colon for abnormalities such as polyps, inflammation, or signs of colorectal cancer.

While the endoscope is a more general term that refers to instruments used to view internal organs or cavities, it does not specifically target the sigmoid section of the large intestine. The otoscope is intended for examining the ear, and the colonoscope, although also used for examining the large intestine, examines a more extensive portion, including the entire colon rather than being limited to just the sigmoid section. Therefore, the sigmoidoscope is the correct choice as it is specifically designed for that particular area of the gastrointestinal tract.