Which of the following is a major lead exposure source?

• A. Air fresheners
• B. Drinking water filters
• C. Lead-based paints
• D. Vitamin supplements

Answer: (C)

Lead exposure mainly comes from deteriorating lead-based paint in older buildings. When this paint ages, it chips and forms dust that can be inhaled or ingested, a particularly risky route for children who put objects in their mouths. Even small amounts of lead accumulate over time and can affect development and health, making this a major exposure source in many settings. The other options do not represent the primary path: air fresheners aren’t known for contributing significant lead; drinking water filters reduce exposure by removing lead from water rather than introducing it; vitamin supplements can be contaminated in rare cases but aren’t considered a major or common source.