One of the constituents of the pancreatic juice which is poured into the duodenum in human beings is:

The pancreatic juice contains several enzymes, including trypsinogen and chymotrypsinogen. These are inactive precursors (zymogens) that are activated in the duodenum. Trypsinogen is converted to trypsin, and chymotrypsinogen is converted to chymotrypsin. Therefore, both trypsinogen and chymotrypsinogen are constituents of pancreatic juice. The correct answer is "Both A and B".