Which of the following is referred to as the "suicide gland"?

The hormone that controls the basal metabolic rate $(BMR)$ in our body is secreted by:

The rate of metamorphosis is increased by .....

The highest concentration of iodine is found in the .....

Grave's disease is caused by the hypersecretion of thyroid hormone and is associated with the

$A$ health disorder that results from the deficiency of thyroxine in adults and is characterised by $(i)$ a low metabolic rate,$(ii)$ an increase in body weight,and $(iii)$ a tendency to retain water in tissues is: