This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: RNTCP, Subject name: Social & Preventive Medicine
[{'content': 'In a suspected TB patient, two boxes are given for sputum sample collection. They are labeled as:- \nSelect and explain. \nA. a, b, B. A, B, C. 1, 2, D. Y, Z', 'role': 'user'}, {'content': "Answer: A \nExplanation: - 2 sputum samples over a period of 2 days is collected in pts, with history of cough > 2weeks. - Spot sample is collected on Day-1; Morning sample is collected on Day-2. Labeling of sputum samples in RNTCP: Diagnosis as well as follow-up samples are labeled with a single LSN with a suffix 'a' for the spot sample and 'b' for morning sample.", 'role': 'assistant'}]