$I.$ Hypothyroidism causes irregularity of the menstrual cycle.
$II.$ Hyperthyroidism adversely affects body physiology.
$III.$ Hypothyroidism causes cretinism.
$IV.$ Hypothyroidism causes goitre.
Which of the above statements are correct?

Why is $Thyroxine$ considered a hormone and not an enzyme?

Which of the following trace elements is involved in the structure of a hormone?

Which of the following is not a genetic disease?

Consider the following statements with respect to Calcitonin:
$I$. It is non-iodised.
$II$. It is secreted by parafollicular cells.
$III$. It regulates the calcium level in blood.
$IV$. It is also called as $TCT$ (Thyrocalcitonin).
$V$. It is a hyperglycemic agent.
Select the option containing correct statements from the above given statements.

Cretinism can be prevented or cured by the administration of