Environmental

Formaldehyde in homes is most commonly found in:

AConcrete foundations
BComposite wood products such as particleboard and plywood✓ Correct
CCopper plumbing pipes
DExterior brick

Explanation

Formaldehyde is emitted from composite wood products (particleboard, MDF, plywood) used in furniture, cabinets, and building materials. It can cause respiratory irritation and is classified as a probable carcinogen.

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