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': 'Trypsin acts on which amino acid- \nSelect and explain. \nA. Proline, B. Lysine, C. Alanine, D. Arginine', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Lysine * Serine protease catalyze hydrolysis of peptide bonds which are connected to specific amino acid residues in substrate protein:-# Chymotrypsin hydrolyses peptide bonds which are connected with carbonyl group of tryptophan, tyrosine and phenylalanine. To some extent, it can attack peptide bonds connected with methionine, histidine, leucine and asparagine residues.# Trypsine catalyses hydrolysis of lysine and arginine esters. It cannot hydrolyse any peptide bond with proline residue.", 'role': 'assistant'}]