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: Medicine
Which of the following true about resistant - TBa) Sputum smear is positive after 5 monthb) Culture is positive after 3 months c) Clinical deteriorationd) Active disease in chest X-ray 
Select and explain. 
A. abd, B. bcd, C. abc, D. ab
C: abc
Answer: C: abc 
Explanation: None