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
One of the longer acting analogue among uterine stimulants 
Select and explain. 
A. Di hydro ergotamine, B. Carbetocin, C. Atosiban, D. Magnesium salts
B: Carbetocin
Answer: B: Carbetocin 
Explanation: 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.