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': 'Best gas used for creating pneumoperitonium at laparoscopy is: \nSelect and explain. \nA. N2, B. O2, C. CO2, D. N20', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]