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
FEV1/FVC is reduced in case of- 
Select and explain. 
A. Pleural effusion, B. Lung fibrosis, C. Asthma, D. All of the above
C: Asthma
Answer: C: Asthma 
Explanation: None