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: Medicine
Thickening of pulmonary alveolar - capillary membrane is seen in : 
Select and explain. 
A. Asthma, B. Bronchitis, C. Pulmonary fibrosis, D. Emphysema
C: Pulmonary fibrosis
Answer: C: Pulmonary fibrosis 
Explanation: Answer is C (Pulmonary fibrosis): Pulmonary Alveolar -- capillary membrane thickening is a characteristic feature of interstitial lung disease like pulmonary fibrosis