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
Which is not an endopeptidase? 
Select and explain. 
A. Trhypsin, B. Pepsin, C. Chymotrypsin, D. Aminopeptidase
D: Aminopeptidase
Answer: D: Aminopeptidase 
Explanation: 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