This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory System, Subject name: Pharmacology
[{'content': 'Drug of choice for acute severe asthma is:- \nSelect and explain. \nA. Sho acting beta 2 agonists, B. Long acting beta 2 agonist, C. Oral theophylline, D. Inhaled ipratropium bromide', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Sho acting beta 2 agonists like salbutamol are drug of choice for acute severe asthma Condition Drug of choice Bronchial Asthma Acute attack Salbutamol Acute attack in pregnancy Salbutamol Acute attack during labour Ipratropium Acute attack in patients on beta blocker therapy Ipratropium Prophylaxis Coicosteroids Exercise-induced asthma Acute attack Salbutamol Prophylaxis Coicosteroids Aspirin-induced asthma Acute attack Salbutamol Prophylaxis Coicosteroids Brittle asthma Type 1 S.C. Terbutaline infusion Type 2 S.C. Adrenaline', 'role': 'assistant'}]