This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Enzyme basics and serine proteases, Subject name: Biochemistry
[{'content': 'Histidine is present at the catalytic site of which of the following enzymes \nSelect and explain. \nA. Hexokinase, B. Carboxypeptidase, C. Trypsin, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Active center of enzymes:- Name of enzyme Impoant amino acid at the catalytic site Chymotrypsin His(57), Asp(102), Ser(195) Trypsin Serine, Histidine Thrombin Serine,Histidine Phosphoglucomutase Serine Alkaline phosphatase Serine Carbonic anhydrase Cysteine Hexokinase Histidine Carboxypeptidase Histidine,Arginine,Tyrosine Aldolase Lysine', 'role': 'assistant'}]