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
[{'content': 'Intrauterine pressure is raised during labour to \nSelect and explain. \nA. 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', 'role': 'user'}, {'content': 'Answer: D \nExplanation: 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', 'role': 'assistant'}]