Goitre is caused by the deficiency of which nutrient?

Goitre is a condition characterized by the abnormal enlargement of the thyroid gland, located in the neck. This enlargement is often a direct result of the thyroid gland's inability to produce sufficient thyroid hormones.

• Iodine (B) is correct. Iodine is an essential trace element crucial for the synthesis of thyroid hormones. A deficiency in iodine leads to reduced hormone production, prompting the thyroid gland to enlarge in an attempt to capture more iodine, resulting in goitre.
• Vitamin D (A) is incorrect; Vitamin D is vital for bone health and calcium absorption, but its deficiency does not directly cause goitre.
• Iron (C) is incorrect; Iron deficiency causes anemia, not goitre.
• Calcium (D) is incorrect; Calcium is essential for bones and teeth, and its deficiency can lead to conditions like osteoporosis, but not goitre.