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: Pharmacology
In MDR TB, Mycobacterium tuberculosis is resistant to: 
Select and explain. 
A. Isoniazid + Ethambutol, B. Rifampcin + Ethambutol, C. Isoniazid + Rifampcin, D. Isoniazid + Pyrazinamide
C: Isoniazid + Rifampcin
Answer: C: Isoniazid + Rifampcin 
Explanation: Mycobacterium tuberculosis resistant to Isoniazid + Rifampicin - MDR.TB
Mycobacterium.tuberculosis resistant to Isoniazid, Rifampicin and one of the Fluoroquinolone and any one of the second line drug used in Mycobacterium.tuberculosis - XDR.TB