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Which of the following is TRUE about radon?
Radon is a colorless, odorless gas that is formed by the incomplete combustion of fossil fuels.
Radon is used as insulation in buildings.
Radon is the leading cause of lung cancer.
Radon is sprayed on furniture as a fire retardant.
Radon is a colorless, odorless gas that is emitted naturally from bedrock.