This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory Infections, Subject name: Social & Preventive Medicine
Prolonged treatment with Isoniazid leads to deficiency of- 
Select and explain. 
A. Pyridoxine, B. Thiamine, C. Pantothenic acid, D. Niacin
A: Pyridoxine
Answer: A: Pyridoxine 
Explanation: Treatment with INH can lead to Pyridoxine deficiency, hence it is given as nutritional prophylaxis alongwith TB treatment.