Final answer:
The large intestine is responsible for absorbing water from indigestible food residue and eliminating feces, consisting of the cecum, colon, and rectum, with the colon further divided into four regions.
Step-by-step explanation:
The organ responsible for drying out indigestible food residue through water absorption and the elimination of feces is the large intestine. The large intestine reabsorbs water from indigestible food material and processes the waste material. This organ is a key part of the digestive system and consists of the cecum, the colon, and the rectum. The colon, which houses beneficial bacteria, is divided into four regions: ascending, transverse, descending, and sigmoid colon. Its main functions include extracting water and mineral salts from undigested food to form feces, which are then eliminated from the body through the anus.