A 6-year-old with asthma is brought in with an acute exacerbation. After nebulised salbutamol and ipratropium, he remains hypoxic. Which additional therapy is recommended in a severe paediatric asthma attack?ANebulised lignocaineBIV magnesium sulphateCOral antihistaminesDSubcutaneous terbutalineEInhaled steroid onlyCheck my answer