______ deficiency is the most common cause of thyroid disease, specifically hypothyroidism.

Correct option is D

Ans: (d) Iodine Sol. Iodine deficiency is the most common cause of hypothyroidism, a condition where the thyroid gland does not produce enough thyroid hormones. Iodine is essential for the production of thyroid hormones, and a lack of iodine in the diet can lead to thyroid dysfunction, particularly in regions where iodine intake is insufficient.
Explanation of each option:
· (a) Calcium: Calcium deficiency is not a primary cause of thyroid disease. While calcium plays an important role in overall health, it does not directly impact thyroid hormone production.
· (b) Iron: Iron deficiency can lead to other health issues like anemia but is not the primary cause of hypothyroidism.
· (c) Sodium: Sodium is important for fluid balance and blood pressure regulation but does not directly affect thyroid function.
· (d) Iodine: Correct answer. Iodine is essential for thyroid hormone synthesis. A deficiency can lead to goiter (enlargement of the thyroid) and hypothyroidism.