Which signal word indicates a highly toxic pesticide with Hazard Class I based on oral, dermal, or inhalation toxicity, where a very small dose could be fatal?

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

Answer: (A)

When a pesticide is in Hazard Class I for acute toxicity, the label uses the strongest warning: Danger-Poison. This signal word combination tells you that even a very small dose can be fatal through any route of exposure—oral, dermal, or inhalation. The other words indicate lower levels of hazard: a standalone Danger is still serious but not the absolute highest, while Warning and Caution point to moderate or slight toxicity. So Danger-Poison is the best answer because it directly communicates the extreme danger and the potential for fatal harm at tiny doses.