<prompt> Which of the following is an adrenergic drug preferred for arresting labour?RitodrineIsoprenalineSalbutamolTerbutaline  <response>: Ref: KDT 6e p323 Isoxsuprine and ritodrine are selective b2 agonists useful as tocolytic agents for arresting labour. Pulmonary edema is an impoant adverse effect of these agents. 