<prompt> Hypothyroidism is associated with deficiency ofIronIodineZincFluorine  <response>: Ans. b Iodine Iodine deficiency leads to hypothyroidism which manifests as goiter. Due to hypothyroidism, thyroid cells try to compensate it by hyperplasia and hypertrophy of thyroid gland cells goiter. Iron deficiency leads to Microcytic anemia IDA. Zinc deficiency may manifest with acrodermatitis enteropathica. Fluorine deficiencyexcess manifests with dental caries.Also KnowOptimum level of fluorine in drining water: -0.5 - 0.8 mg per litre. 