This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: nutrition and digestion, Subject name: Biochemistry
[{'content': 'Which is not an endopeptidase? \nSelect and explain. \nA. Trhypsin, B. Pepsin, C. Chymotrypsin, D. Aminopeptidase', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Endopeptidases. They act on peptide bonds inside the protein molecule so that the protein becomes successively smaller and smaller units. This group includes Pepsin, Trypsin, Chymotrypsin, and Elastase.Ref: DM Vasudevan, page no: 13', 'role': 'assistant'}]