Goitre is caused by deficiency of
iodine
The correct option is A:
Explanation of the correct option :
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.