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': 'Which enzyme is not release as proenzyme? \nSelect and explain. \nA. Pepsin, B. Amylase, C. Trypsin, D. Chymotrypsin', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ptyalin(alpha amylase) aids digestion of starch to produce dextrin and maltose. Ref.Textbook of physiology by AK Jain 7th edition page no.209', 'role': 'assistant'}]