Find the odd number / letters / word from the given alternative.

Cretinism is a form of mental retardation caused by a lack of iodine in the diet. It is characterized by a large head, short stature, and a slow mental development.

Marasmus is a form of malnutrition that occurs in children who are not given enough calories. It is characterized by a thin body, loose skin, and a lack of energy.

Goitre is a swelling of the thyroid gland, which is located in the neck. It is caused by a lack of iodine in the diet.