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
Which is the most frequently used gas for laproscopy? 
Select and explain. 
A. Carbon Dioxide, B. Helium, C. Nitrogen, D. Oxygen
A: Carbon Dioxide
Answer: A: Carbon Dioxide 
Explanation: Ans. is 'a' i.e., Carbon Dioxide o CO2 is the most common gas used to create surgical pneumoperitoneumo Other gases that have been tried are:a) Heliumb) Nitrous Oxide