<prompt> All of the following explains diagnosis of Asthma exceptAfter administering bronchodilator FEV1 increase to 200mL within 15 minutesPEFR shows diurnal variation of 2012 reversibility in FEV1 on administering bronchodilatorDiffusion Lung Capacity for carbon monoxide is decreased  <response>: DLCO is normal in Asthma. 