Explanation
Trypsinogen is converted to active trypsin by the action of Enterokinase. Therefore, the correct answer is option C.
Trypsinogen is an inactive precursor of trypsin, which is an enzyme that plays an important role in the digestion of proteins in the small intestine. Trypsinogen is produced by the pancreas and stored in the pancreatic ducts until it is released into the small intestine.
When food enters the small intestine, a hormone called enterokinase, which is produced by the small intestine, activates trypsinogen by cleaving off a small part of the molecule. The resulting active enzyme is called trypsin.
Once trypsin is activated, it can then activate other digestive enzymes such as chymotrypsin and carboxypeptidase, which also help in the digestion of proteins.
Cholecystokinin, Enterocrinin, and Secretin are also hormones involved in the digestive system, but they do not play a direct role in the activation of trypsinogen to trypsin.
