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': 'Rapid test used by WHO for tuberculosis ? \nSelect and explain. \nA. Quanteferon gold, B. ELISPOT, C. Xpe MTB, D. Sputum AFB', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Sputum AFB Sputum smear microscopy is the quickest and easiest procedure. But it lacks both sensitivity and specificity. Smears are stained by ziehl-Neelsen acid-fast stain. Sputum smear examination (by AFB stain) is the method of choice for case finding. Note : Genexpe MTB/RIF is also a fast test (results within 90 minutes), but it is not routinely recommended by WHO.", 'role': 'assistant'}]