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': 'In Revised National TB Control Program mainstay of diagnosis of pulmonary tuberculosis is: \nSelect and explain. \nA. Sputum AFB, B. CXR, C. Clinical examination, D. PCR', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans: A (Sputum AFB) Ref: Textbook of Preventive and Social Medicine, 22nd edition page no 396 & Flowchart is by Textbook of Community Medicine, 1st edition, Armed Force Medical College, Pane COUGH FOR 2 WEEKS OR MORE | 2 Sputum smears - |- | | 1 or 2 Positives 2 Negatives | | Antibiotics10-14 days | Cough Persists | Repeat 2 SputumExamination | 1 or 2 Positives 2 Negative || | X-ray chest || Suggestive of TB Negative for TB|| | |Sputum Positive PTBAnti TB Treatment Sputum negative PTB Anti TB Treatment Non TB', 'role': 'assistant'}]