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': 'Half-life biological of oxytocin: \nSelect and explain. \nA. 2-3 min, B. 3-4 min, C. 5-6 min, D. 7-8 min', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Oxytocin is a nanopeptide synthesised by supraoptic and paraventricular nuclei of hypothalamus. It is rapidly metabolised and degraded by oxytocinase and hence has a half life of 3 - 4 minutes and a duration of action of approximately 20 minutes. (DC Sutta TB of obstetrics 8th edtn pg 573)', 'role': 'assistant'}]