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
Bronchial asthma can be diagnosed by-a) Wheezeb) Dyspneac) Normal FEV1d) Coughe) Reversible obstruction 
Select and explain. 
A. a, B. b, C. ae, D. ad
C: ae
Answer: C: ae 
Explanation: None