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
Diagnosis of tuberculosis in community is made by ? 
Select and explain. 
A. Tuberculin test, B. Sputum for AFB, C. Case fatality rate, D. PCR
B: Sputum for AFB
Answer: B: Sputum for AFB 
Explanation: <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>