Lead entry via hand-to-mouth transfer demonstrates which route of entry?

• A. Inhalation
• B. Ingestion
• C. Absorption
• D. Dermal

Answer: (B)

Hand-to-mouth transfer leads to ingestion because the lead-contaminated dust or chips are swallowed when fingers are put in the mouth, so the material enters the body through the mouth and digestive system. Inhalation would involve breathing lead particles into the lungs, which isn’t what’s described here. Dermal entry would require lead to pass through the skin, and while skin contact can contribute, lead doesn’t readily absorb through intact skin, so the described scenario best demonstrates ingestion.