This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Operative Gynecology, Subject name: Gynaecology & Obstetrics
The best gas used for pneumoperitoneum laparoscopy is 
Select and explain. 
A. N2, B. O2, C. CO2, D. NO
C: CO2
Answer: C: CO2 
Explanation: Carbon dioxide is the most widely used peritoneal distention medium, because it is non-flammable, colourless and has a higher blood solubility than air & the rapid absorption of CO2 in blood reduces the incidence of gas emboli.