This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Peritoneum, Subject name: Surgery
Gas used in laparoscopy is- 
Select and explain. 
A. CO2, B. SO2, C. N2, D. O2
A: CO2
Answer: A: CO2 
Explanation: Ans. (a) CO2 (Ref: Bailey and Love 27th edition page 105, Surgery Sixer 3rd Edition Page 49)* Ideal gas used in Laparoscopy is Carbon Dioxide because it is easily absorbable and diffusible after surgery.* Rarely Air and nitrogen has been used.* Intraperitoneal pressure during surgery must be kept between 12-15mmHg.