Iodine deficiency in animals commonly causes which condition?

• A. Iron deficiency
• B. Iodine deficiency
• C. Vitamin D deficiency
• D. Calcium deficiency

Answer: (B)

Iodine is essential for making thyroid hormones (T3 and T4). When iodine is lacking, thyroid hormone production drops, and the body responds by increasing thyroid-stimulating activity, which often leads to enlargement of the thyroid gland and related health problems such as slowed growth and reproductive issues in animals. In the context of the options given, the condition that directly reflects the lack of iodine is the iodine deficiency itself, since the question is asking what condition results from that deficiency. The other options refer to deficiencies of completely different nutrients (iron, vitamin D, calcium) and are not caused by a lack of iodine. So the best choice aligns with the fact that iodine deficiency is the condition being referenced. If you see signs like an enlarged thyroid or reduced growth, these point to iodine deficiency as the underlying issue.