This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Asthma, Subject name: Pharmacology
[{'content': 'Maximum effect of bronchodilatation in asthma is caused by - \nSelect and explain. \nA. Corticosteroids, B. Theophylline, C. Anticholinergic, D. Beta 2-Agonist', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., b2-Agonist b-agonists in Asthmao Bronchi have b2-adrenergic receptors which cause bronchodilatation - So, the adrenergic drugs used in asthma are selective b2 agonists.o b2-agonists are the most effective bronchodilatorso b2-agonists have some other effects also on airways (other than bonrchodilatation), that are responsible for beneficial effects in asthma:Inhibition of release of mast cells mediators -mast cells stabilizing action.Inhibition of exudation and airway edema.Increased mucociliary clearanceDecreased cougho b2-agonists have no effect on inflammation - no antiinflammatory action.", 'role': 'assistant'}]