What is one common sign of chemical exposure in a victim?

Answer: B — Respiratory distress

Respiratory distress is a particularly common sign of chemical exposure because many hazardous materials can directly affect the respiratory system. When a person is exposed to harmful chemicals, especially those that are inhaled, the body may respond by having difficulty breathing, wheezing, coughing, or experiencing chest tightness. These symptoms arise as the body reacts to the irritants or toxic substances in the airways and lungs. This aligns with the understanding of the pathways through which various chemicals can enter the body; inhalation is a primary route for numerous hazardous materials. Thus, respiratory distress serves as a direct indicator that can emerge quickly following exposure, allowing responders to recognize the urgency of the situation. While nausea, rashes, and headaches can also occur from chemical exposure, they are not as universally recognized or as immediate as respiratory distress when considering the impacts of breathing in toxic substances. Each symptom can indicate exposure, but respiratory distress is often the most critical to identify promptly as it can escalate quickly and leads to life-threatening scenarios if not addressed immediately.