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': 'In pyridoxine deficiency, tryptophan is converted to - \nSelect and explain. \nA. Nicotine, B. Acetoacetate, C. Xantheurenic acid, D. Acetyl CoA', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Xantheurenic acid o In vitamin B6 deficiency the metabolism is shuted to xanthurenic acid. Therefore, xantheurenic acid excretion is increased in urine.", 'role': 'assistant'}]