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Which of the following is a symptom of allergenic reaction?

  1. Headache

  2. Hives or rash

  3. Increased thirst

  4. Fatigue

The correct answer is: Hives or rash

A symptom of an allergic reaction involves the immune system's response to a substance it mistakenly identifies as harmful. One of the hallmark indicators of this reaction is the appearance of hives or a rash. Hives are raised, itchy welts on the skin that can vary in size and can appear anywhere on the body. They result from the release of histamine and other chemicals during an allergic response, leading to increased blood flow and swelling. In contrast, while headaches, increased thirst, and fatigue can be associated with various other health conditions and even some allergic reactions, they are not specific indicators of an allergic reaction. Hives or rashes provide a clearer and more direct connection to an allergic response, making this symptom particularly relevant for those studying food safety and managing food allergies. Understanding these symptoms is crucial in food management practices to ensure the safety of individuals with known allergies.