XDR-TB is resistant to -: (A) AKT(HRZE), (B) HRKN, (C) HRKO, (D) HREEt
Answer is C. Extensively drug resistant TB is defined as resistance to atleast rifampicin, & isoniazid,in addition to any quinolone & atleast one injectable second line agent(kanamycin). Reference: Harrison20th edition pg 1079