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': 'Catecholamines are synthesized from \nSelect and explain. \nA. Tryptophan, B. Tyrosine, C. Methionine, D. Histidine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Tyrosine -------------------->DOPA ---------------->dopamine ----------------->norepinephrine ----------------->epinephrine (catecholamines)Ref: DM Vasudevan - Textbook of Biochemistry, 7th edition, page no: 235', 'role': 'assistant'}]