Which statement best describes the hallmark of anaphylaxis and its immediate management?

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Anaphylaxis is a rapidly evolving, life-threatening systemic allergic reaction. Its hallmark is sudden onset with involvement of the airway and/or circulation, such as airway swelling or bronchospasm with hypotension or collapse. This distinguishes it from localized or non-emergent reactions. The immediate management is intramuscular epinephrine administered promptly, because it reverses the main pathophysiologic changes: vasoconstriction to raise blood pressure and reduce mucosal edema, plus bronchodilation to relieve airway obstruction. After giving epinephrine, secure the airway as needed, provide high-flow oxygen, and start aggressive fluid resuscitation to maintain perfusion. Antihistamines and corticosteroids can help with symptoms but do not stop progression, so they are adjuncts after epinephrine. In short, acute airway/circulatory involvement treated immediately with epinephrine and supportive care best captures the hallmark and management of anaphylaxis.