This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Labour - II, Subject name: Gynaecology & Obstetrics
[{'content': 'Mean half life of oxytocin? \nSelect and explain. \nA. 3 min, B. 30 min, C. 2 min, D. 1 min', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Oxytocin has a half life of approximately 3-5 minutes.', 'role': 'assistant'}]