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': 'Diagnosis of TB ace 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: Ans. is 'a' i.e., 1 out of 2 samples positive o Two sputum smear samples are examined. o If any of the two samples or both the samples are positive, the diagnosis of smear-positive TB is confirmed.", 'role': 'assistant'}]