This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Gynaecology & Obstetrics
[{'content': 'During suction evacuation in MTP the negative pressure of suction should be : \nSelect and explain. \nA. 100 to 200 mm Hg, B. 200 to 300 mm Hg, C. 400 to 600 mm Hg, D. 700 to 900 mm Hg', 'role': 'user'}, {'content': 'Answer: C \nExplanation: 400 to 600 mm Hg', 'role': 'assistant'}]