This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pathology
Vitamin deficiency associated with increase xanthurenic acid excretion in urine 
Select and explain. 
A. Thiamine, B. Pyridoxine, C. Ascorbic acid, D. Niacin
B: Pyridoxine
Answer: B: Pyridoxine 
Explanation: .