This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Communicable diseases, Subject name: Social & Preventive Medicine
A patient with sputum positive pulmonary tuberculosis is on ATT for the last 5 months but the patient is still positive fo AFB in the sputum. This case refers to - 
Select and explain. 
A. New case, B. Failure case, C. Relapse case, D. Drug defaulter
B: Failure case
Answer: B: Failure case 
Explanation: - any patient treated with category I of DOTS who has a positive s near at 5 months of the treatment should be considered as failure case. - the patient should be staed with Category II treatment afresh. Reference : Park's textbook of preventive and social medicine, 23rd edition, pg no:188 <\p>