What is the definition of stool?

Stool is defined as the solid waste matter that is excreted from the digestive tract through the anus. It primarily consists of undigested food, bacteria, and cells shed from the lining of the intestines. In this context, option B accurately captures this definition by referring specifically to excreted feces.

Understanding the different types of waste produced by the body is also crucial. Liquid waste produced by the kidneys, associated with urine, is not related to stool and reflects a separate physiological process of excreting metabolic byproducts. Waste produced by the liver is primarily bile, which aids in digestion and does not constitute stool. Lastly, while ingested food components are relevant to digestion, they do not represent the final product that is expelled as stool. The focus is on the end result of the digestive process, emphasizing the role of stool as the solid byproduct of digestion.