A secretion that digests both carbohydrates and proteins is:

Explanation

Option A: Ptyalin is a form of amylase found in the saliva of humans and some other animals.It digests only carbohydrates,not proteins.Hence,Option A is incorrect. Option B: Saliva consists of: Water and mucus Sodium bicarbonate and other salts Ptyalin or amylase Saliva contains the enzyme amylase, also called ptyalin, which is capable of breaking down starch into simpler sugars such as maltose that can be further broken down in the small intestine.But,saliva does not contain enzymes for protein digestion. Hence,Option B is incorrect. Option C: Pepsin is an enzyme responsible for protein digestion and is released in the form of pepsinogen in the stomach. Option D: Pancreas makes pancreatic juices called enzymes. It contains enzymes to break down proteins,carbohydrates and lipids.It contains: Amylase or amylopsin(for starch digestion) Lipase(for lipids digestion) Trypsin in the form of trypsinogen(for protein breakdown) Hence, Option D is correct. Option E: Gastric juice comprises water, mucus, hydrochloric acid, pepsin, and intrinsic factor. Of these five components, pepsin is the principal enzyme involved in protein digestion. There are no enzymes in gastrin for carbohydrate digestion. Hence,Option E is incorrect.