Which of the following is a sign of airway burns?

Visible swelling or burns in the mouth is a clear indicator of airway burns due to thermal or chemical exposure. The presence of swelling suggests that tissues in the upper airway have been subjected to heat or harmful substances, leading to inflammation. This can obstruct airflow and restrict breathing, which is critical to recognize in emergency situations.

Other signs that might be associated with differing conditions, such as redness around the eyes, headaches or dizziness, and fever or chills, may arise from various causes but are not specifically indicative of airway burns. For example, redness around the eyes may suggest an allergic reaction or irritation, while headaches or dizziness could be associated with various respiratory or systemic issues, and fever or chills typically relate to infections. Thus, visible swelling or burns in the mouth is the most relevant and direct sign of airway burns.