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': 'Amino acid required for formation of thyroxine? \nSelect and explain. \nA. Tryptophan, B. Tyrosine, C. Glutamine, D. Cysteine', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b i.e., Tyrosine The term thyroid hormone denotes both thyroxine (7'4) and triodothyronine (T3). Both T4 and T3 are iodine derivatives of thyronine. Thyronine is a condensation product of two molecules of amino acid tyrosine. Thyroxine is 3, 5, 3', 5' - tetraiodothyronine and T3 is 3, 5, 3 '-triiodothyronine. Thyroid hormones are synthesized and stored in the thyroid follicles as apa of thyroglobulin molecule.", 'role': 'assistant'}]