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: Surgery
Pressure needed for abdominal insufflation in laparoscopy is: 
Select and explain. 
A. 10 mm Hg, B. 20 mm Hg, C. 30 mm Hg, D. 40 mm Hg
A: 10 mm Hg
Answer: A: 10 mm Hg 
Explanation: Laparoscopic surgery can be performed under local anesthesia, but general anesthesia is preferable. Under local anesthesia, N2O is used as the insufflating agent, and insufflation is stopped after 2 L of gas is insufflated or when a pressure of 10 mmHg is reached. Ref: Schwaz's principle of surgery 9th edition, chapter 14.