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
[{'content': 'All are tocolytics except \nSelect and explain. \nA. Ritodrine, B. Salbutamol, C. Isoxsuprine, D. Misoprostol', 'role': 'user'}, {'content': 'Answer: D \nExplanation: 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', 'role': 'assistant'}]