<prompt> Which first line antitubercular drug is bacteriostatic ?INHRifampicinEthambutolPyrazinamide  <response>: Ans. is c i.e., Ethambutol o All first line drugs are tuberculocidal except ethambutol which is tuberculostatic.Thberculocidal -Rifampin, INH, streptomycin, pyrazinamide.Tuberculostatic - Ethambutol, PAS, cycloserine, thioacetazone. 