Which signal word indicates the highest toxicity?

• A. Warning (Moderate)
• B. Caution (Low)
• C. Danger/Poison (High)
• D. Advisory (Low)

Answer: (C)

Signal words on pesticide labels communicate how toxic a product is and how precautions should scale with that hazard. The highest level of acute toxicity is shown by Danger (Poison), which tells you exposure could cause severe harm or death and requires the most stringent precautions, including maximum PPE and strict handling and entry rules.

Moderate toxicity is indicated by Warning, and low toxicity by Caution, so those signals call for fewer or less protective measures. Advisory isn’t used as the primary hazard signal on pesticide labels, so it doesn’t indicate the same level of danger.