Which signal word must appear on all products that are highly toxic by any route of entry into the body and can cause death in very low doses?

• A. Danger-Poison
• B. Danger
• C. Warning
• D. Caution

Answer: (A)

Signal words on pesticide labels convey how dangerous the product is and guide the precautions you should take. When a product is extremely toxic by any route of entry and can cause death in very low doses, the label uses the strongest warning: the combined phrase “Danger-Poison.” This tells you that exposure—even small amounts—can be fatal, so you must treat it with maximum care, use protective equipment, and follow all safety directions. The other words—Danger, Warning, and Caution—indicate progressively lower levels of hazard and wouldn’t apply to a substance this lethal. Therefore, the best fit to communicate this highest level of risk is Danger-Poison.