This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Abnormal labor, Subject name: Gynaecology & Obstetrics
All are tocolytics except 
Select and explain. 
A. Ritodrine, B. Salbutamol, C. Isoxsuprine, D. Misoprostol
D: Misoprostol
Answer: D: Misoprostol 
Explanation: Misoprostol is indicated in cervical ripening prior to Labour whereas tocolytics inhibit uterine contractions and keep the uterus quiescent. Reference: Textbook of Obstetrics : Sheila Balakrishnan pg. 573,196