This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Proteins and Amino Acids, Subject name: Biochemistry
[{'content': 'Melanin is formed from which aminoacid? \nSelect and explain. \nA. Phenylalanine, B. Tyrosine, C. Tryptophan, D. Histidine', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., TyrosineAmino acidsBiological important compoundTyrosineCatecholamines (epinephrine, norepinephrine, dopamine), thyroxine, triiodothryonine, melanin.(Note : - Phenylalanine is the precursor of tyrosine, thus it can also give rise to all these compounds through tyrosine (phenylalanine - Tyrosine - Catecholamines, thyroxine, T3' melanin).TryptophanVitamin niacin, melatonin, SerotoninGlycine, Arginine, methionineCreatineGlycine, cysteineBile saltsGlycineHemeAspartic acid and glutaminePyrimidine basesGlycine, aspartic acid, glutaminePurine basesb-alanineCoenzyme-AArginineNitric oxideHistidine, Arginine, lysineKeratinMethionine, lysineCarnitineGABAGlutamateGlutamate, cysteine, glycineGlutathione", 'role': 'assistant'}]