The largest compartment in ruminant stomach is __________________?

A. Rumen
B. Reticulum
C. Abomasum
D. Omasum
The rumen (on the left side of the animal) is the largest stomach compartment and consists of several sacs. It can hold 25 gallons or more of material depending on the size of the cow. Because of its size, the rumen acts as a storage or holding vat for feed.