This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Physiology
[{'content': 'Gastro-intestinal hormone in the following is \nSelect and explain. \nA. Pepsin, B. Ptyalin, C. Cholecystokinin, D. Trypsin', 'role': 'user'}, {'content': "Answer: C \nExplanation: Option 'A' Pepsin is a proteolytic enzyme in gastric juice. Option 'B' Ptyalin or amylase is an amylolytic (carbohydrate splitting) enzyme in saliva. Option 'D' Trypsin is a proteolytic enzyme in pancreatic juice.\nCholecystokinin-Pancreozymin is a gastro-intestinal hormone that has actions on both pancreas and gall bladder.", 'role': 'assistant'}]