A 23-year-old man collapses at a barbecue shortly after eating prawns. He has generalised urticaria, facial swelling, hoarse voice, expiratory wheeze and a systolic blood pressure of 80 mmHg. What is the single most important immediate treatment?ANebulised salbutamolBIntramuscular adrenaline 0.5 mg (1:1000) into the lateral thighCIV hydrocortisone 200 mgDIV chlorphenamineERapid infusion of normal saline aloneCheck my answer