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': 'Melatonin is derived from - \nSelect and explain. \nA. Tyrosine, B. Tryptophan, C. Glutathione, D. None', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is -b' i.e., Tryptophan Amino acidsBiological important compoundTyrosineCatecholamines (epinephrine Q, norepinephrine Q, dopamine Q), thyroxine Q. triiodothrvonine, melanin Q.(Note : - Phenylalanine is the precursor of tyrosine, thus it can also give rise to all these compounds through tyrosine (phenylalanine - Tyrosine Q - Catecholamines Q, thyroxine Q, T3 melanin Q).TryptophanVitamin niacin Q, melatonin Q, Serotonin QGlycine Q,Arginine Q,methionine QCreatine QGlycine, cysteineBile saltsGlycineHemeAspartic acid and glutaminePyrimidine basesGlycine Q, aspartic acid, glutaminePurine bases Qb-alanineCoertzyme-AArginineNitric oxide QLysine, MethionineCarnitine", 'role': 'assistant'}]