This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Chemotherapy: General Principles, Subject name: Pharmacology
Prolonged treatment with INH leads to deficiency of: 
Select and explain. 
A. Pyridoxine, B. Thiamine, C. Pantothenic acid, D. Niacin
A: Pyridoxine
Answer: A: Pyridoxine 
Explanation: Ans. (A) Pyridoxine(Ref: Katzung 11th/e p825, KDT 8th/e p818)Isoniazid can cause peripheral neuropathy due to deficiency of pyridoxine.