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Q. Deficiency of which of the following nutrients is the most common cause of goiters?
Answer: Iodine
Notes: A goitre, or goiter, is a swelling in the neck resulting from an enlarged thyroid gland. A goitre can be associated with a thyroid that is not functioning properly. Worldwide, over 90% of goitre cases are caused by iodine deficiency. The term is from the Latin gutturia, meaning throat.

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