A 34-year-old woman with a known peanut allergy accidentally ingests peanuts and rapidly develops generalized urticaria, lip swelling, wheeze, and hypotension. According to Canadian anaphylaxis guidance, what is the first-line treatment?AIntravenous antihistamineBInhaled salbutamol aloneCIntramuscular adrenaline into the anterolateral thighDIntravenous corticosteroids as first-lineEObservation without medication because symptoms may resolveCheck my answer