This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Amino Acid Metabolism, Subject name: Biochemistry
[{'content': 'Tyrosine utilized in synthesis of all except - \nSelect and explain. \nA. Melanin, B. Melatonin, C. Dopamine, D. Thyroxine', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Melatonin o Dopamine b-hydroxylase is a 'copper ' containing monooxygenase that requires ascorbic acid and molecular oxygen.o It catalyzes the formation of norepinephrine.", 'role': 'assistant'}]