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

Failure of thyroid secretion from infancy leading to dwarfism and mental retardation is included under:

The largest endocrine gland is:

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

Which one of the following hormones contains iodine?

$A$ pregnant lady delivers a baby who suffers from stunted growth,mental retardation,low intelligence quotient and abnormal skin. This is the result of $:-$