This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T., Subject name: Physiology
[{'content': 'Enterokinase is an activator of: \nSelect and explain. \nA. Trypsinogen, B. Trypsin, C. Chymotrypsin, D. Antitrypsin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A TrypsinogenRef: Ganongy 25th ed. pg 479* Trypsinogen is converted to active enzyme trypsin by enterokinase when the pancreatic juice enters into the duodenum. Enterokinase contains 41% polysaccharide and this high polysaccharide content prevents the enterokinase from getting digested.* The trypsin, chymotrypsin and elastase act at interior peptide bonds in the peptide molecules and are called as endopeptidases.', 'role': 'assistant'}]