Which statement best defines toxicity?

• A. The study of poisons.
• B. The dosage of a toxic substance.
• C. The chronic exposure effects.
• D. The effects of toxicants, including acute toxicity.

Answer: (D)

Toxicity is the adverse effects produced by a toxicant in a living organism, encompassing how harm can arise from exposure and that harm can occur acutely or with longer-term, chronic exposure. The best choice describes the effects of toxicants, including acute toxicity, which captures the full range of harmful outcomes rather than focusing on a single aspect. The other statements are narrower: one refers to the field that studies poisons, another to the dose itself, and another to chronic effects only. Hence, describing the effects of toxicants—including acute toxicity—best defines toxicity.