This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of protein and amino acid, Subject name: Biochemistry
[{'content': 'All are essential amino acid except \nSelect and explain. \nA. Phenylalanine, B. Lysine, C. Leucine, D. Glycine', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The essential amino acids are Isoleucine, Leucine Threonine Lysine, Methionine, Phenylalanine, Tryptophan, and Valine.Ref: DM Vasudevan - Textbook of Biochemistry for Medical Students, 7th edition, page no: 27', 'role': 'assistant'}]