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': 'What happens to ETCO2 on increasing rate and depth of breathing \nSelect and explain. \nA. Increases, B. Decreases, C. Remain high, D. No change', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]