This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pharmacology
[{'content': 'One of the longer acting analogue among uterine stimulants \nSelect and explain. \nA. Di hydro ergotamine, B. Carbetocin, C. Atosiban, D. Magnesium salts', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Carbetocin is a newer longer acting analogue of oxytocin . Now a days oxytocin use is reduced and this newer acting analogue is being used. Ref: katzung 12th ed, endocrinology.', 'role': 'assistant'}]