This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anti Microbial, Subject name: Pharmacology
Multi drug resistant TB is resistance to: 
Select and explain. 
A. Isoniazid, B. Rifampicin, C. Isoniazid/ rifampicin, D. All first line drugs
C: Isoniazid/ rifampicin
Answer: C: Isoniazid/ rifampicin 
Explanation: Ans. C. Isoniazid/rifampicinMultidrug resistance in TB is resistance to both isoniazid and rifampicin. It is fatal form of disease. Apart from first line, second line drugs can be given which are levofloxacin, moxifloxacin, kanamycin, amikacin, cycloserine, ethionamide, PAS can be given.