This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Tryptophan metabolism detail, Subject name: Biochemistry
[{'content': '5-hydroxyindoleacetate is a catabolic product of \nSelect and explain. \nA. Histidine, B. Tyrosine, C. Phenylalanine, D. Tryptophan', 'role': 'user'}, {'content': 'Answer: D \nExplanation: 5-hydroxyindoleacetate (5-HIAA) is a catabolic product of serotonin, which is derived from tryptophan.', 'role': 'assistant'}]