<prompt> Mycobacterium tuberculosis is said to be Multi - drug resistant if it is resistant to:Isoniazid aloneRifampicin AloneBoth Isoniazid and RifampicinIsoniazid, Rifampicin, Ethambutol  <response>: 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 