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': 'Case finding in RNTCP is based on - \nSelect and explain. \nA. Sputum culture, B. Sputum microscopy, C. X -ray chest, D. Mantoux test / PCR', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Sputum microscopy Following information has been added in 22nd/e of Park o Liquid culture method is now gold standard for TB diagnosis. Confirmation is done from biological characteristics of culture growth and selected molecular & biochemical tests. Rapid immunochromatographic assay (strip speciation tests) provides a definitive identification of M. tuberculosis and is recommended. J Caridge based nucleic acid amplification test : -A second generation NAAT - based TB diagnostic test has sensitivity almost similar to liquid culture. o In microscopy, following methods helps in early diagnosis of large number of cases : - (i) Fluorescence microscopy by auramine stain, (ii) Light - emitting diode fluorescence microscopy (LEDs). o Drug susceptibility testing provide a definitive diagnosis of drug -resistant TB. A number of techniques are used : i) Phenotype method (detect drug resistance) : - Three methods are used : propoion, absolute concentration and resistance ratio. ii) Genotype methods (detect molecular mutations responsible for resistance) : - e.g., Molecular testing for rifampic in resistance.", 'role': 'assistant'}]