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
All of the following cause Hyperventilation except: 
Select and explain. 
A. Decreased pH in CSF, B. Decreased plasma HCO3, C. CO poisoning, D. Increased adrenergic levels
C: CO poisoning
Answer: C: CO poisoning 
Explanation: C i.e. CO poisoning