This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory Function, 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: Ans. is 'c' Asthma. FEV/FVC is reduced in cases of obstructive lung diseases and remain normal or increase in case of restrictive lung disease.Asthma is an obstructive lung disease so FEV/FVC is reduced in it.