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
In T.B/ a ‘case’ is” 
Select and explain. 
A. Cough, B. Mantoux positive, C. Sputum positive, D. X-ray positive
C: Sputum positive
Answer: C: Sputum positive 
Explanation: None