<prompt> A most common mode of treatment of a 1-year-old child with asthma isInhaled short acting beta 2 agonistOral short acting theophyllineOral ketotifenLeukotriene agonist  <response>: Treatment of asthma Treatment of asthma can be divided into -A Treatment of chronic asthmaB Treatment of acute exacerbation -Treatment of mild, moderate or severe exacerbationTreatment of life-threatening exacerbation status asthmaticusTreatment of chronic asthmaTreatment of chronic asthma is given to control asthma and to prevent acute exacerbation.Severity of asthma is classified on the basis of -The frequency of daytime symptoms The frequency of nighttime symptoms The degree of airflow obstruction FEV1Peak expiratory flow PEF variabilityFor children less than 5 years of age, severity is classified on the basis of 1 and 2 only because young children cannot perform the manoeuvre required for lung function measurement 3 4.I Mild intermittent Symptoms for 2 daysweek Symptoms for 5 2 nightmonth FEV1 80 PEF variability 20 2 Mild persistent Symptoms 2days week PEF variability 20-30 Symptoms 2 night months FEV1 80 3 Moderate persistent Day symptoms daily Symptoms I nightweek FEV1 60 - 80 PEF variability 30 A stepwise pharmacological therapy is indicated. 4 Severe persistentContinuous day symptomsFrequent night symptomsFEVi 60PEF variability 30 