This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General obstetrics, Subject name: Gynaecology & Obstetrics
The half-life of oxytocin is 
Select and explain. 
A. 2-3 min, B. 3-5 min, C. 5-6 min, D. 7-8 min
B: 3-5 min
Answer: B: 3-5 min 
Explanation: OxytocinIn general, oxytocin should be discontinued if the number of contractions persists with a frequency of more than five in a 10-minute period or more than seven in a 15-minute period or with a persistent nonreassuring fetal hea rate pattern.When oxytocin is stopped, its concentration in plasma rapidly falls because of the half-life is approximately 3 to 5 minutes.Ref: William&;s Obstetrics; 25th edition