Which of the following is NOT a product that contains PCBs?

Organic produce is not a product that contains PCBs (polychlorinated biphenyls). PCBs are synthetic organic chemicals that were commonly used in various industrial applications due to their non-flammability, chemical stability, and electrical insulating properties. However, they have been banned in many countries, including the United States, due to their environmental toxicity and potential human health risks.

Caulking, thermal insulation, and carbonless copy paper are all products that have been found to contain PCBs, especially those manufactured prior to the PCB ban in 1979. These materials may have been used in building construction and everyday office supplies, leading to PCB contamination. In contrast, organic produce is cultivated without synthetic pesticides or fertilizers, and hence does not contain harmful substances like PCBs. This makes organic produce a safe option in terms of avoiding PCB exposure.