A 30-year-old man develops generalised urticaria, wheeze, stridor and hypotension immediately after a penicillin injection. What is the single most appropriate first-line drug treatment?AIntravenous ChlorphenamineBIntravenous HydrocortisoneCIntramuscular Adrenaline into the anterolateral thighDNebulised Salbutamol onlyEOral PrednisoloneCheck my answer