How is lead poisoning defined?

• A. Reduced IQ, learning disabilities.
• B. Kidney damage, hypertension.
• C. Toxic accumulation of lead in the body.
• D. Lead-based paint.

Answer: (C)

Lead poisoning is defined by the toxic accumulation of lead in the body, the overall body burden that comes from ongoing exposure. This definition focuses on the presence of lead in blood and tissues at harmful levels, not on a single symptom or a specific source. The health effects like reduced IQ or learning disabilities are important consequences but are outcomes, not the definition itself. Similarly, kidney damage or hypertension are possible effects, not the definition, and lead-based paint is a exposure source rather than what defines lead poisoning. So the best answer centers on the toxic accumulation of lead in the body.