This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Classification and metabolism of amino acids, Subject name: Biochemistry
[{'content': 'Xanthurenic acid is the metabolite in the metabolism of \nSelect and explain. \nA. Uric acid, B. Xanthine, C. Tryptophan, D. Uronic acid', 'role': 'user'}, {'content': 'Answer: C \nExplanation: 3-Hydroxy Kynurenine is one of the intermediate in tryptophan catabolism, which gets conveed to next intermediate and this conversion requires vitamin B6/ PLP. So, in B6 deficiency, this reaction does not occur and 3-Hydroxy Kynurenine is diveed to form alternate metabolite, Xanthurenic acid (See fig), which is excreted in urine', 'role': 'assistant'}]