The correct option is A Goitre
The most prevalent cause of goitre is a lack of iodine. Iodine is required for the production of thyroid hormone by the organism. If you don't get enough iodine in your food, your thyroid expands to try to absorb as much as possible so it can generate the correct quantity of thyroid hormone. As a result, a goitre may indicate that the thyroid is unable to produce adequate thyroid hormone.