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: Anaesthesia
[{'content': 'The most important determinant of carbon dioxide elimination is \nSelect and explain. \nA. Minute ventilation, B. Fresh gas flow, C. Expiratory reserve volume, D. Vital capacity', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Fresh gas flow is important determinant of carbon dioxide elimination in breathing circuits.', 'role': 'assistant'}]