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
Intrauterine pressure is raised during labour to: 
Select and explain. 
A. 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
D: All of the above
Answer: D: All of the above 
Explanation: 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