The digested food in small intestine is absorbed into blood vessels in the walls of small intestine through millions of tiny finger-like outgrowths called W. The undigested and unabsorbed food from the small intestine enters into another organ X. The organ X absorbs most of the water from the undigested waste food material making ir semi-solid. This semi-solid waste is stored in Part Y of organ X for some time. It is passed out from the body through part Z in the form of faeces.
What is Z?

Explanation

Anus