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': 'Hypoxic hypoxia with increased (A - a) gradient is seen in \nSelect and explain. \nA. Diaphragmatic paralysis, B. Pulmonary fibrosis, C. Respiratory centre depression, D. Severe asthma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Hypoxic hypoxia with increased (A-a) gradiant is seen in Type I Respiratory failure ⇒ Pulmonary fibrosis.', 'role': 'assistant'}]