What are the basic elements of the quantitative risk assessment process?

• A. hazard identification, exposure assessment, ecological assessment, toxicity assessment
• B. hazard identification, ecological assessment, regulatory review, risk characterization
• C. dose-response assessment, site survey, population characterization, risk characterization
• D. hazard identification, exposure assessment, toxicity assessment, risk characterization

Answer: (D)

Quantitative risk assessment combines identifying what could cause harm with how that harm relates to dose, how much exposure people receive, and then summarizing the overall risk. The best answer lists hazard identification, exposure assessment, toxicity assessment, and risk characterization. Here, toxicity assessment corresponds to the dose–response piece—the part that links the amount of exposure to the likelihood or severity of adverse effects, which is essential for quantifying risk. The other options include elements like ecological assessment, regulatory review, site survey, or population characterization, which aren’t part of the standard four-step quantitative risk assessment. So this combination best captures the process.