Thyroid follicular cells secrete which hormones?

$I.$ 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?

The largest endocrine gland is:

An organ $X$ has a large blood supply. It produces a hormone,the lack of which causes a disease known as cretinism. The organ is

Which gland regulates the $BMR$ and body temperature?

What are the effects of hypothyroidism (observed during pregnancy) on the development and maturation of a growing baby?