Exophthalmic goitre is caused due to the overactivity of
(a) thymus (b) thyroid
(c) parathyroid (d) adrenal cortex.
(b) thyroid
Exophthalmic goitre, endocrine disorder that is the most common cause of hyperthyroidism (excess secretion of thyroid hormone) and thyrotoxicosis (effects of excess thyroid hormone action in tissue).