This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Infection, Subject name: Pediatrics
Mycobacterium tuberculosis is said to be Multi - drug resistant if it is resistant to: 
Select and explain. 
A. Isoniazid alone, B. Rifampicin Alone, C. Both Isoniazid and Rifampicin, D. Isoniazid, Rifampicin, Ethambutol
C: Both Isoniazid and Rifampicin
Answer: C: Both Isoniazid and Rifampicin 
Explanation: Ans. C. Both Isoniazid and RifampicinM tuberculosis is said to be multidrug resistant if it is resistant to Rifampicin and Isoniazid. And it is known as XDR if it is resistant to Rifampicin, Isoniazid, Fluoroquinolone and one of the three injectable drugs (Amikacin, kanamycin and capreomycin)