Injury produced from a single toxic exposure is called _____ toxicity.

• A. Acute
• B. Chronic
• C. LD50
• D. Lethal

Answer: (A)

Injury produced from a single toxic exposure is acute toxicity. Acute toxicity refers to harmful effects that occur after a one-time or short-term exposure to a substance, with symptoms appearing soon after exposure. That matches the scenario in the question, where the injury comes from a single event rather than repeated exposures.

Chronic toxicity, by contrast, results from repeated or long-term exposure, even if each individual exposure is small. LD50 is a statistical measure used to describe the dose that would be lethal to 50% of a test population, not a description of the exposure pattern or the type of toxicity. Lethal describes death-causing effects in general, but it isn’t the category used to describe how toxicity develops over time.