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
EV1/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: Answer is C (Asthma): Reduction in FEVIFVC is the hallmark of obstructive lung diseases. Amongst the options provided, Asthma is the only obstructive disease and thus the answer of choice. The hallmark in obstructive pattern of disease is a decrease in expiratory flow rates. Decrease in Forced Expiratory flow rate (FEF25_75) and FEVIFVC are characteristic.