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 circled part of given capnograph reflects \nSelect and explain. \nA. Inspiration, B. Alveolar air, C. Mixed air, D. Dead space air', 'role': 'user'}, {'content': 'Answer: B \nExplanation: This is phase 3 which represents only alveolar air.', 'role': 'assistant'}]