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
A 'Case' in T is defined as - 
Select and explain. 
A. X-ray positive, B. Culture positive, C. Sputum AFB positive, D. Tuberculosis positive
C: Sputum AFB positive
Answer: C: Sputum AFB positive 
Explanation: None