The trypsinogen is an enzyme secreted by the

The correct answer is D. Pancreas.

Trypsinogen is an inactive form of trypsin, a digestive enzyme that breaks down proteins into smaller peptides. It is produced by the pancreas and released into the small intestine, where it is activated by enteropeptidase, an enzyme produced by the cells lining the small intestine. Trypsin then helps to digest proteins in food.

The liver is a large organ that performs many important functions in the body, including the production of bile, which helps to digest fats. The ileum is the last part of the small intestine, and the duodenum is the first part of the small intestine. Neither of these organs produces trypsinogen.