Goitre is caused by deficiency of

The correct option is A

iodine

The correct option is A:

Explanation of the correct option :

1. Goitre is caused by a nutritional deficiency of iodine.
2. Swelling of the thyroid gland is observed.
3. Iodine is necessary for the production of thyroid hormones.

Explanation of the incorrect option :

Option B :

The deficiency of iron leads to anemia.

Option C :

The deficiency of sodium leads to lethargy and confusion.

Option D :

The deficiency of calcium leads to osteoporosis.

Final answer: Goitre is caused by a deficiency of iodine.