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': 'The method of choice of tuberculosis detection in mass screening is: \nSelect and explain. \nA. Tuberculin test, B. Mass miniature radiography (MMR), C. Sputum smear examination by direct microscopy, D. Sputum culture', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The method of choice of tuberculosis detection in mass screening is Sputum smear examination by direct microscopy . The reliability, cheapness and ease of direct microscopic examination has made it number one case-finding method. 2 sputum smears samples over a period of 2days is collected in pts with history of cough > 2 weeks. ZN staining. - if result is 0+/2 = SS -VE - 1+/2, 2+/2 = SS +ve', 'role': 'assistant'}]