What is a major exposure route?

• A. Contaminated drinking water
• B. Inhalation of clean air
• C. Sunlight exposure
• D. Eating unwashed vegetables

Answer: (A)

Exposure routes describe how a chemical can enter the body. In many safety assessments, ingestion is the dominant path because people consistently take substances into their bodies by swallowing them. Contaminated drinking water provides a direct, everyday way for toxins to be swallowed and absorbed through the digestive tract, so it stands out as a major exposure route.

The other options don’t fit as clearly. Inhaling clean air implies no hazard, since the air isn’t carrying a contaminant. Sunlight exposure isn’t a chemical entry route; it relates to UV radiation rather than chemical absorption. Eating unwashed vegetables can be a route if those vegetables carry contaminants, but it’s less universal and direct than drinking water as a primary exposure pathway.