'Exophthalmic goitre' $(Grave's\,disease)$ is caused due to

The thyroid gland is homologous to which part of lower vertebrates?

Graves' disease is caused by . . . . . . .

The $BMR$ of body cells is regulated by $........$.

The hormone that decreases the level of calcium in the blood is -

The thyroid gland is composed of $A$ lobes which are located on either side of the $B$. The lobes are interconnected with a thin flap of connective tissue called $C$. Select the correct combination for $A, B$ and $C$.