MDR tuberculosis is defined by -

Ans. is 'd' i.e., Resistance to isoniazid and rifampicin o MDR is defined as resistance INH and rifampicin with or without resistence to other drugs. XDR is defined as resistance to INH and rifampicin as well as to all fluoroquinolones and one of injectable drugs (capreomycin, kanamycin, amikacin).