Radon is a colorless, odorless, and radioactive gas produced from uranium decay, making it a health concern in enclosed spaces. The other options listed do not exhibit these characteristics. Therefore, radon is the correct answer. ;
Radon is the correct answer as it is a colorless, odorless, radioactive gas produced from the decay of uranium. It can accumulate in buildings and poses health risks, particularly related to lung cancer. The other options provided do not fit this description.
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