Multi drug resistant T.B is defined as resistance to: (A) INH and pyrizinamide, (B) INH and Rifampicin, (C) Rifampicin and Pyrizinamide, (D) Resistance to all first line of drugs
Answer is B. multidrug-resistant TB (MDR-TB)--a form of the disease caused by bacilli resistant at least to isoniazid and rifampin--occurred in 2013. Ref Harrison 19th edition pg 1103