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: Gynaecology & Obstetrics
[{'content': 'Gas commonly used in laparoscopy is: March 2004 \nSelect and explain. \nA. CO2, B. SO2, C. N2, D. O2', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A i.e. CO2', 'role': 'assistant'}]