<prompt> MDR TB must be treated for at least ?12 months18 months20 months36 months  <response>: Ans. is c i.e., 20 months Resistance or intolerance to H Throughout 6 RZE Resistance or intolerance to R Throughout 12-18 HZEQ Resistance to H R Throughout at least 20 months ZEQ S for another injectable agents Resistance to all first-line drugs Throughout at least 20 months 1 injectable agent 3 of of these 4 ethionamide cycloserine, Q, PAS Intolerance to Z HRE 