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
The circled part of given capnograph reflects 
Select and explain. 
A. Inspiration, B. Alveolar air, C. Mixed air, D. Dead space air
B: Alveolar air
Answer: B: Alveolar air 
Explanation: This is phase 3 which represents only alveolar air.