(A) Fluorosis is a condition caused by the excessive intake of fluoride. In the human body,fluoride ions $(F^-)$ react with calcium $(Ca^{2+})$ presen

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(A) Fluorosis is a condition caused by the excessive intake of fluoride. In the human body,fluoride ions $(F^-)$ react with calcium $(Ca^{2+})$ present in bones and teeth to form calcium fluoride $(CaF_2)$. This process leads to the hardening and brittleness of bones and teeth,a condition known as fluorosis. Therefore,the correct element is $Ca$.