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': 'Administration of pure O2 to hypoxic patients is dangerous because: \nSelect and explain. \nA. Apnea occurs due to hypostimulation of peripheral chemo receptor, B. Pulmonary edema, C. DPG, D. Convulsions', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Apnea occurs due to hypostimulation of peripheral chemo receptor', 'role': 'assistant'}]