The correct option is C Succus entericus
The intestinal juice or succus entericus is secreted by crypts of Lieberkuhn. Succus entericus is the alkaline secretion produced by glands in the wall of the duodenum, consisting of water, mucoproteins and hydrogen carbonate ions. It helps to counteract the highly acidic and proteolytic chyme entering the small intestine from the stomach, and thus protects the duodenum from damage.