This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Biochemistry
[{'content': 'Creatinine is formed from - \nSelect and explain. \nA. Glycine, B. Lysine, C. Leucine, D. Histamine', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Creatinine and creatine are synthesized from glycine, arginine and methionine.Synthesis of creatine and creatinineCreatine and creatinine are not amino acids, but specialized products of amino acids. Creatine is synthesized from glycine, arginine and methionine. Synthesis sta with formation of guanidoacetate from glycine and arginine in kidney. Fuher reactions takes place in liver and muscle.', 'role': 'assistant'}]