This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory system, Subject name: Medicine
The pulmonary function test done on this patient of asthma would be 
Select and explain. 
A. Non-infarmative, B. Obstructive pattern, C. Restrictive pattern, D. Destructive pattern
B: Obstructive pattern
Answer: B: Obstructive pattern 
Explanation: The patient is having atopic asthma.Pulmonary function tests in asthma show an obstructive pattern with reduced FEV1,FEV1/FVC ratio.Reversibility is demonstrated by a >12% and 200 ml increase in FEV1 15 minutes after an inhaled sho acting beta2 agonist or in some patients by a 2 to 4 week trial of oral coicosteroids. Ref:Harrison's medicine-18th edition,page no:2109.