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
Case finidng in RNTCP is based on - 
Select and explain. 
A. Sputum culture, B. Sputum microscopy, C. X-ray chest, D. Mantoux test \/ PCR
B: Sputum microscopy
Answer: B: Sputum microscopy 
Explanation: - the case finding tool in RNTCP is based on sputum examination. - sputum smear examination by direct microscopy is now considered the method of choice. Reference : Park's textbook of preventive and social medicine, 23rd edition, pg no:429 <\p>