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': 'Catecholamines are synthesized from ? \nSelect and explain. \nA. Tryptophan, B. Tyrosine, C. Methionine, D. Histidine', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Tyrosine Catecholamines (epinephrine, norepinephrine and dopamine) are synthesized from tyrosin. Has been explained in previous seesions.", 'role': 'assistant'}]