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: Anatomy
Intrauterine pressure is raised during labour to 
Select and explain. 
A. First stage - 40 to 50 mm Hg, B. Second stage- 100 to 120 mm Hg, C. Third stage - 100 to 120 mm Hg, D. All the above
D: All the above
Answer: D: All the above 
Explanation: Intrauterine pressure during labor: First stage - 40 to 50 mm Hg Second stage- 100 to 120 mm Hg Third stage - 100 to 120 mm Hg