Which of the following radioactive isotopes is used to detect thyroid cancer?

$A$ is essential for the normal rate of hormone synthesis in the thyroid. Deficiency of iodine in our diet results in $B$ and enlargement of the thyroid gland,commonly called $C$. Select the correct combination for $A, B$,and $C$.

Which hormonal deficiency is responsible for the following:
$(a)$ Diabetes mellitus
$(b)$ Goiter
$(c)$ Cretinism.

The two lobes of the thyroid gland are connected by a thin flap of connective tissue called the.....

Calcitonin secretion is stimulated by

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