Which signs indicate an allergic reaction?

• A. Hives and runny nose
• B. Sneezing and watery eyes
• C. Rash, swelling, difficulty breathing
• D. Mild headache

Answer: (C)

Allergic reactions show both skin involvement and potentially airway symptoms. Hives or a rash are common signs, but when swelling occurs and breathing becomes difficult, the reaction is more serious and can progress quickly toward a dangerous airway reaction. The combination of rash, swelling, and difficulty breathing covers both skin and airway involvement, signaling a significant allergic reaction that requires prompt attention. The other lists include allergy-like signs such as sneezing, watery eyes, or mild headache, which can occur with allergies or colds but don’t jointly indicate the more urgent signs of an allergic reaction that affects the airway.