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: Microbiology
After initiation of DOTS therapy for category-I, first sputum examination is done at: March 2010 
Select and explain. 
A. 1 month of treatment, B. 2 months of treatment, C. 4 months of treatment, D. 6 months of treatment
B: 2 months of treatment
Answer: B: 2 months of treatment 
Explanation: Ans. B: 2 months of treatment The treatment in Category I consists of an intensive phase of H, R, Z and E administered under a direct supervision thrice weekly on alternate days for 2 months, followed by a continuation phase of H and R thrice weekly on alternate days for 4 months In the Category 1 follow-up, sputum examination is done at 2, 4 and 6 months of treatment. If smear is positive after 2 months, the intensive phase is extended for one more month and sputum examinations done at 3, 5 and 7 months.