This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Asthma, Subject name: Medicine
A Patient with history of shortness of breath has Decreased FEV1/FVC Ratio, Normal DLCO. A 200 ml increase in baseline FEVI is observed 15 minutes after administration of bronchodilators. The likely diagnosis is - 
Select and explain. 
A. Asthma, B. Chronic Bronchitis, C. Emphysema, D. Interstitial Lung Disease
A: Asthma
Answer: A: Asthma 
Explanation: Ans. is 'a' i.e., Asthma