Final answer:
The knee-chest position is typically used for rectal or sigmoid exams, facilitating better visualization and access to the sigmoid colon and rectum.
The correct option is 2.
Step-by-step explanation:
The exam position that is typically used for rectal or sigmoid exams is the knee-chest position. This position allows the healthcare provider to best visualize and access the rectum and sigmoid colon. In the knee-chest position, the patient kneels on the examination table with their knees apart, leans forward on their chest and elbows, with the buttocks elevated.
This position creates an advantageous angle for the physician to insert an endoscope for procedures such as a flexible sigmoidoscopy, in which a small camera is used to examine the interior of the sigmoid colon and rectum.
It's important to note that while the knee-chest position is commonly used for rectal exams, other positions like the left lateral decubitus may also be utilized depending on the patient's condition and the physician's preference.
The correct option is 2.