A deficiency of which of the following minerals is a very common and preventable cause of mental retardation?

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Iodine deficiency is a very common and preventable cause of mental retardation, especially in areas where iodine is not naturally present in the soil and is not added to salt or other food sources. Zinc deficiency can cause growth retardation and impaired immune function, iron deficiency can cause anemia, and excessive fluoride intake can cause dental fluorosis and skeletal fluorosis, but none of these are typically associated with mental retardation.

A Deficiency of Which of the Following Minerals Is a Very