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
By WHO best criteria for TB diagnosis is 
Select and explain. 
A. Sputum + ve, B. Chest pain, C. Cough – 3 weeks, D. X-ray finding
A: Sputum + ve
Answer: A: Sputum + ve 
Explanation: None