A mild allergic reaction to contrast material is typically exhibited by which symptom?

A mild allergic reaction to contrast material is primarily characterized by symptoms such as hives, which are raised, itchy welts on the skin. Hives occur when the immune system reacts to an allergen, releasing histamines that cause blood vessels to leak fluid into the surrounding tissues, resulting in swelling and irritation.

In the context of contrast media, allergic reactions can range from mild, including hives, to more severe reactions such as anaphylaxis. Hives are a common dermatological symptom associated with mild allergic responses, and their presence indicates a localized response that is generally not life-threatening.

Other symptoms associated with more serious allergic reactions may involve the respiratory system or cardiovascular system but differ significantly in severity and presentation. For example, respiratory infections, sudden death, and acute renal failure are not typical signs of a mild allergic reaction to contrast material. Thus, the symptom of hives specifically aligns with what is expected in cases of mild allergy, confirming it as the correct choice in this context.