This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: COPD and Asthma, Subject name: Medicine
[{'content': 'A 13-year-old known asthmatic presents with severe wheezing and a respiratory rate of 40. Her pulse rate is 120. What is the next best step in management of this patient? \nSelect and explain. \nA. Oxygen and nebulised salbutamol, B. Oxygen and Metered dose inhaler of salmeterol, C. Oxygen and intravenous Aminophylline, D. Oxygen and Intravenous magnesium sulphate', 'role': 'user'}, {'content': 'Answer: A \nExplanation: For severe acute asthma | Oxygen & Nebulized salbutamol is recommended Other option- Oxygen and metered dose inhale of salmeterol - for prevention of asthma Oxygen and Intravenous aminophylline - cause toxicity Oxygen & IV Magnesium sulphate - not recommended now days', 'role': 'assistant'}]