A major cause of preventable mental retardation among the poor is:

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Quizplus · Accepted Answer

Iodine deficiency is a major cause of preventable mental retardation among the poor. Iodine is essential for the production of thyroid hormone, which is critical for brain development, particularly during fetal and early childhood stages. Without sufficient iodine, the thyroid gland fails to produce enough hormone, resulting in stunted growth and impaired cognitive development. Iodine deficiency is most common in developing countries where access to iodized salt or other sources of iodine is limited.

A Major Cause of Preventable Mental Retardation Among the Poor