This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Classification and metabolism of amino acids, Subject name: Biochemistry
[{'content': 'Transamination is the first step in the catabolism of many amino acids. All of the following amino acids undergo transamination, EXCEPT \nSelect and explain. \nA. Alanine, B. Threonine, C. Glutamate, D. Aspaate', 'role': 'user'}, {'content': "Answer: B \nExplanation: All of the common amino acids except lysine, Threonine, Proline, and Hydroxyproline paicipate in transamination. Transamination is not restricted to alpha amino groups. The delta amino group of ornithine (but not the e-amino group of lysine) readily undergoes transamination. Mnemonic to remember the amino acids which don't undergo transamination:- POLYTHENE - PO (proline/hydroxyproline) LY (lysine) THENE (threonine )", 'role': 'assistant'}]