This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: FMGE 2018, Subject name: Medicine
In which of the following conditions there is an increase in lung diffusion capacity? 
Select and explain. 
A. Emphysema, B. Idiopathic pulmonary fibrosis, C. Alveolar haemorrhage, D. Pulmonary oedema
C: Alveolar haemorrhage
Answer: C: Alveolar haemorrhage 
Explanation: DLCO is increased in alveolar hemorrhage whereas it decreases in pulmonary edema, idiopathic pulmonary fibrosis, emphysema.