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
Intrauterine pressure is raised during labour to : 
Select and explain. 
A. First stage -- 40-50 mmHg, B. Second stage -- 100-200 mmHg, C. Third stage -- 100-200 mmHg, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: Intrauterine pressure is raised to 40-50 mmHg in the first stage 100-200 mmHg in the second stage 100-200 mmHg maintained in the third stage The diminished pain is due to lack of stretching effects D.C.DUTTA'S TEXTBOOK OF GYNECOLOGY,Pg no:117,7th edition