Which of the following is a visual sign of a chemical attack?

• A. Eye irritation
• B. Burning
• C. Vomiting and diarrhoea
• D. Breathing difficulties

Answer: (A)

Recognizing visual signs of chemical exposure. Eye irritation is something you can see happening to someone—the eyes may tear up, redden, water, or the person may squint and rub their eyes right after exposure to irritants like certain chemical vapors. That visible cue stands out as a natural first signal to responders that a chemical agent might be involved. The other options describe sensations or bodily symptoms that aren’t as easily visible to others: burning is something the person feels, not something you reliably observe from a distance; vomiting and diarrhoea are internal reactions that aren’t immediately outwardly visible; breathing difficulties can be observed, but they’re not specific to chemical exposure and can result from many other causes. So the clear, observable visual sign among the choices is eye irritation.