<prompt> Which of the following is NOT a tocolytic agent?NifedipineMgSO4DinoprostoneTerbutaline  <response>: The inhibition of uterine contractions, or tocolysis, has been the mainstay therapy for pre-term labour. Specific tocolytic agents are adrenergic receptor agonists Terbutaline, Ritodrine, MgSO4, Ca2 channel blockers Nifedipine, COX inhibitors, oxytocin-receptor antagonists, and nitric oxide donors. Two forms of prostaglandins are commonly used for cervical ripening prior to induction at term a Misoprostol PGE1 and Dinoprostone PGE2 Ref: Schimmer B.P., Parker K.L. 2011. Chapter 66. Contraception and Pharmacotherapy of Obstetrical and Gynecological Disorders. In L.L. Brunton, B.A. Chabner, B.C. Knollmann Eds, Goodman Gilmans The Pharmacological Basis of Therapeutics, 12e Archie C.L. 2007. Chapter 10. The Course Conduct of Normal Labor Delivery. In A.H. DeCherney, L. Nathan Eds, CURRENT Diagnosis Treatment Obstetrics Gynecology, 10e 