Final answer:
An arthroscope is part of the standard set-up for a diagnostic knee arthroscopy because it allows surgeons to examine and operate on the knee joint with minimal incision.
Step-by-step explanation:
The correct answer to the question is a) Arthroscope. An arthroscope is a type of endoscope that is specifically designed for joint surgeries such as knee arthroscopy. During a knee arthroscopy, an arthroscope is inserted into the knee joint through a small incision. The device has a fiber optic video camera that allows the surgeon to see inside the joint space without making large incisions. This enables them to diagnose and treat joint disorders and injuries. The other options listed, such as the sigmoidoscope, colposcope, and laparoscope, are endoscopes used for different parts of the body. A sigmoidoscope is used for the lower part of the colon, a colposcope is used for the cervix, and a laparoscope is used for abdominal or pelvic surgery.