This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: COPD and Asthma, Subject name: Medicine
What will be reversible damage? 
Select and explain. 
A. Fev1 decrease by 50 % by SABA, B. Fev1 increase by 12% by SABA, C. Fev1 decrease by 25% by SABA, D. Fev1 decrease by 5% by SABA
B: Fev1 increase by 12% by SABA
Answer: B: Fev1 increase by 12% by SABA 
Explanation: In this question primarily we talking about asthma= We give salbutamol FEV1 becomes Normal Change of FEV1 before & after giving salbutamol (SABA) should be at least 12% to call it Bronchial Asthma.