What should be done for a person experiencing an allergic reaction?

For a person experiencing an allergic reaction, calling emergency services and keeping them calm is the most appropriate course of action. Allergic reactions can range from mild symptoms, such as hives or itching, to severe ones, like anaphylaxis, which is a life-threatening condition that requires immediate medical attention.

Keeping the person calm is also essential, as anxiety can exacerbate symptoms and lead to complications. While awaiting emergency services, monitoring the person's breathing and level of consciousness is crucial to provide important information to responders.

In contrast, other options do not address the seriousness of an allergic reaction. Administering food or a glass of water could be dangerous, especially if the person is experiencing throat swelling or difficulty breathing, as it may further obstruct their airway. Applying a cold compress may provide temporary relief for local reactions, but it does not address the systemic nature of a serious allergic reaction, particularly if it's anaphylactic. Immediate medical intervention is vital, making the appropriate response calling for help and maintaining the person's composure.