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
Sputum positive TB patients on chemotherapy should be isolated at least for 
Select and explain. 
A. 3 weeks, B. 2 weeks, C. 4 weeks, D. 6 weeks
A: 3 weeks
Answer: A: 3 weeks 
Explanation: None