This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of protein and amino acid, Subject name: Biochemistry
[{'content': 'Serotonin is derived from \nSelect and explain. \nA. Tyrosine, B. Tryptophan, C. Phenylalanine, D. Methionine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Serotonin is a metabolite of tryptophan Tryptophan ------------------->5hydroxy tryptophan ------------------>5hyroxy tryptamine (serotonin )Ref: DM Vasudevan - Textbook of Biochemistry, 7th edition, page no: 241', 'role': 'assistant'}]