<prompt> Dose response curves of salbutamol for bronchodilation and tachycardia are widely separated on dose axis. This information suggested that sulbutamol isHighly potent cardiac stimulantHighly efficacious bronchodilatorHighly toxic drugHighly selective drug  <response>: Ref-Katzung 10e p28,29 Wide Separation of two curves on DRC suggest that the dose required to produce one action is much higher than the other. 