This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Tuberculosis, Subject name: Social & Preventive Medicine
[{'content': 'Prevalence of TB in a community is estimated by: \nSelect and explain. \nA. Tuberculin test, B. AFB smear, C. Chest X-Ray, D. Montouxtest', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) Tuberculin testRef: K. Park 23rd ed. /185* Tuberculin Test is the only way of estimating the prevalence of infection in a community.# A positive test indicates past or present infection by Mycobacterium tuberculosis.# Remember: a positive tuberculin test is NOT a confirmatory diagnostic of M.TB.* Sputum smear examination (Z-N stain) by direct microscopy is the diagnostic choice for TB case detection.* Chest X-Ray is a supportive diagnostic test for TB.* Montoux test is also a screening test for TB. A positive test indicates current or past infection.', 'role': 'assistant'}]