Answer & Explanation
D) Crypts of Lieberkuhn
Succus Entericus is the alkaline secretion produced by glands in the wall of the duodenum, consisting of water, mucoproteins, and hydrogencarbonate ions.
Succus Entericus is secreted by Crypts of Lieberkuhn.
It helps to counteract the highly acidic and proteolytic chyme entering the small intestine from the stomach, and thus protects the duodenum from damage.