This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pharmacology
[{'content': 'Maximum effect of bronchodilatation in asthma is caused by ? \nSelect and explain. \nA. Coicosteroids, B. Theophylline, C. Anticholinergic, D. b2-Agonist)', 'role': 'user'}, {'content': 'Answer: D \nExplanation: b-agonists in Asthma Bronchi have , b-adrenergic receptors which cause bronchodilatation - So, the adrenergic drugs used in asthma are selective b2 agonists. b-agonists are the most effective bronchodilators 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 clearance Decreased cough b2-agonists have no effect on inflammation- no antiinflammatory action. REF : katzung pharmacology : 14th ed', 'role': 'assistant'}]