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': 'Amino acid required for formation of thyroxine \nSelect and explain. \nA. Tryptophan, B. Tyrosine, C. Glutamine, D. Cysteine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Metabolic role of Tyrosine * Synthesis of thyroid hormones: Thyroxine (T4) and triiodothyronine (T3) * Synthesis of catecholamines * Synthesis of melanin pigment * Formation of tyramine * Formation of phenol and cresol * Formation of tyrosine-O-sulphateRef: Textbook of medical biochemistry, MN Chatterji, 8th edition, page no: 497', 'role': 'assistant'}]