This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Normal Labour, Subject name: Gynaecology & Obstetrics
[{'content': 'Intrauterine pressure is raised during labour to: \nSelect and explain. \nA. First stage -- 40-50 mm Hg, B. Second stage -- 100-120 mm Hg, C. Third stage -- 100-120 mm Hg, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. is d, i.e. All of the aboveIntrauterine pressure during labor:StagePressure* 1st* 40-50 mm Hg* 2nd* 100-120 mm Hg* 3rd* 100-120 mm Hg', 'role': 'assistant'}]