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: Social & Preventive Medicine
[{'content': 'Which vitamin deficiency may be observed in a patient on INH therapy: September 2012 \nSelect and explain. \nA. Thiamine, B. Pyridoxine, C. Folic acid, D. Cyanocobalamin', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans: B i.e. Pyridoxine The main cause of pyridoxine deficiency is a lack of pyridoxine in the diet. Another cause of vitamin B6 deficiency is the use of the ATT medication isoniazid, and for this reason, it is usually replaced with vitamin B6 whilst using this drug.', 'role': 'assistant'}]