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: Physiology
[{'content': 'All of the following cause Hyperventilation except: \nSelect and explain. \nA. Decreased pH in CSF, B. Decreased plasma HCO3, C. CO poisoning, D. Increased adrenergic levels', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. CO poisoning', 'role': 'assistant'}]