This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
[{'content': 'Drug of choice for acute severe asthma is: September 2006 \nSelect and explain. \nA. Sho acting beta 2 agonists, B. Long acting beta 2 agonists, C. Oral theophylline, D. Inhaled ipratropium bromide', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A: Sho acting beta 2 agonists Severe asthma (Continuous symptoms; activity limitation; frequent exacerbations/hospitalization) requires: Regular high dose of inhaled steroid (800-2000 microgram/ day) through a large volume spacer device and inhaled long acting beta2 agonist (Salmeterol). Additional treatment with one or more of the following: Leukotriene antagonist/Sustained release oral theophylline/ oral beta2 agonist/ inhaled ipratropium bromide. Rescue treatment with sho acting inhaled beta2 agonist In patients not adequately controlled or those needing frequent emergency care-institute oral steroid therapy.', 'role': 'assistant'}]