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
[{'content': 'Which of the following gas is most commonly used in laproscopy? \nSelect and explain. \nA. CO2, B. N2O, C. O2, D. Helium', 'role': 'user'}, {'content': 'Answer: A \nExplanation: CO2 is used in laproscopy because it is common to the human body and can be absorbed by tissue and removed by the respiratory system. It is also non-flammable, which is impoant because electrosurgical devices are commonly used in laparoscopic procedures.', 'role': 'assistant'}]