This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory system, Subject name: Anatomy
[{'content': 'False statement about type I respiratory failure is \nSelect and explain. \nA. Decreased paO2, B. Decreased PaCO2, C. Normal PaCO2, D. Normal A-a gradient', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ref Harrison 19 th ed pg 1731 Type I respiratory failure is characterized by an increase in alveolar aerial O2 gradient,due to ventilation perfusion mismatch.', 'role': 'assistant'}]