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
Hypoxic hypoxia with increased (A - a) gradient is seen in 
Select and explain. 
A. Diaphragmatic paralysis, B. Pulmonary fibrosis, C. Respiratory centre depression, D. Severe asthma
B: Pulmonary fibrosis
Answer: B: Pulmonary fibrosis 
Explanation: Hypoxic hypoxia with increased (A-a) gradiant is seen in Type I Respiratory failure ⇒ Pulmonary fibrosis.