This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Biochemistry
In pyridoxine deficiency, tryptophan is conveed to ? 
Select and explain. 
A. Nicotine, B. Acetoacetate, C. Xantheurenic acid, D. Acetyl CoA
C: Xantheurenic acid
Answer: C: Xantheurenic acid 
Explanation: Ans. is 'c' i.e., Xantheurenic acid