This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Communicable diseases, Subject name: Social & Preventive Medicine
[{'content': 'Diagnosis of tuberculosis in community is made by ? \nSelect and explain. \nA. Tuberculin test, B. Sputum for AFB, C. Case fatality rate, D. PCR', 'role': 'user'}, {'content': 'Answer: B \nExplanation: <p> Diagnosis of TB is made by 2 sputum smear for AFB. Park&;s textbook of preventive and social medicine,K.Park,23rd edition,page no:429. <\\p>', 'role': 'assistant'}]