This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Structure and function of protein, Subject name: Biochemistry
[{'content': 'All have aromatic rings except \nSelect and explain. \nA. Phenylalanine, B. Tyrosine, C. Tryptophan, D. Lysine', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Aromatic amino acids are Tyrosine, tryptophan, and phenylalanine.Ref: Textbook of medical biochemistry, MN Chatterji, 8th edition, page no: 78', 'role': 'assistant'}]