This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Health programmes in India, Subject name: Social & Preventive Medicine
[{'content': 'Diagnosis of TB acc to DOTS? \nSelect and explain. \nA. 1 out of 2 samples positive, B. 2 out of 3 samples positive, C. 3 out of 3 samples positive, D. None', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 1 or 2 positives put of 2 sputum smear is considered as smear positive TB Ref: PARK&;S TEXTBOOK OF PREVENTIVE AND SOCIAL MEDICINE 23rd edition pg 429', 'role': 'assistant'}]