What is a common therapeutic use of Endoscopy?

The correct answer highlights that a common therapeutic use of endoscopy is the visual examination of the digestive tract. Endoscopy encompasses a variety of procedures that utilize an endoscope—a flexible tube with a light and camera—to visually assess the interior of hollow organs. In the case of the digestive tract, endoscopy allows for the identification of conditions such as ulcers, tumors, or inflammation within the esophagus, stomach, and intestines. It can also be used for therapeutic interventions such as biopsies, removal of polyps, or treatment of bleeding.

Other options do not align with the primary functions of endoscopy. Bone marrow biopsy, for instance, involves sampling bone marrow from the hip or sternum and does not utilize an endoscope. Nephrectomy refers to the surgical removal of a kidney, which is a more invasive surgical procedure rather than a visualization technique. Cardiac catheterization involves inserting a catheter into the heart's blood vessels, primarily focused on diagnosing and treating heart conditions, not related to the visual examination of the digestive tract. Thus, the context of endoscopy as it pertains to the digestive system solidifies option C as the correct choice.