<prompt> Drug of choice for acute excacerbation of bronchial asthma -Leukotriene antagonistsLipoxygenase inhibitorsBeta 2 agonistsAnticholinergics  <response>: Ans. is c i.e., Beta 2 agonists Treatment of acute asthmao The only drugs effective for the treatment of acute attack of asthma are bronchodilators b2-receptor agonists, anticholinergics, and methylxanthines.1. Mild attacks For patients with mild attack inhalation of a short acting b2 receptor agonist, e.g. salbutamol albuterol is used. An inhaled anticholinergic, e.g. ipratropium may be added if there is no satisfactory response to b2-agonists alone. In patients who are refractory to inhaled therapies, i.v. aminophylline theophylline may be effective.2. Severe attacks Oxygen plus continuous administration of aerosolized salbutamol albuterol plus systemic steroids, e.g. methylprednisolone, hydrocortisone. Recently, MgSO4 has been tried in acute severe asthma by IV or inhalational route. 