Chronic toxicity occurs when?

• A. After long-term exposure
• B. Immediately after exposure
• C. Hours after exposure
• D. Upon first exposure

Answer: (A)

Chronic toxicity comes from long-term, repeated exposure to a toxin, with harmful effects that may take months or years to become evident. It reflects the cumulative dose over time, not a single event. This is different from acute toxicity, where effects appear soon after exposure, typically within minutes to hours. In pest work, chronic effects are a key concern because repeated contact with pesticides can gradually harm organs or systems even if each exposure seems minor. That’s why the option describing effects after long-term exposure is the best answer. Immediate, hourly, or first-exposure effects point to acute or short-term toxicity, not chronic.