The organ in the digestive system that has a function most similar to the function of the bladder in the excretory system is the large intestine (A).
The large intestine absorbs water and salts from the remaining indigestible food matter and compacts waste into stool, which is stored until it is excreted. This storage function is somewhat analogous to the bladder, which collects and stores urine before it is excreted from the body.