Which hormone deficiency is responsible for the following?

(a) Diabetes mellitus is characterized by abnormally high glucose levels in the blood due to the deficiency of hormone, called insulin.

(b) Goitre is characterised by an abnormal enlargement of the thyroid gland due to the deficiency of thyroxin hormone in the body.

(c) Cretinism is characterized by stunted growth in the baby due to the deficiency of thyroid hormone in the body.