<prompt> MDRTB must be treated for at least-12 months18 months20 months36 months  <response>: Ans. is c i.e., 20 months Resistance or intolerance to HThroughout6RZEResistance or intolerance to RThroughout 12-18HZEQResistance to H RThroughout at least 20 monthsZEQ S for another injectable agentsResistance to all first-line drugsThroughout at least 20 months1 injectable agent 3 of of these4 ethionamide cycloserine, Q, PASIntolerance to Z2HRE 