The results of the pulmonary functions tests shownbelow, the best diagnosis is

Ans. is 'a' i.e., Asthma All expiratory parameters are reduced in the data given with timed vital capacity of 29%. FEV1/FVC is reduced in obstructive airway disease with lowering of peak expiratory flow rates. Due to air trapping in asthma the DLco may be normal or increased