When the thyroid secretion is too much,the gland itself gets enlarged; conversely,if the secretion is too little,the gland gets

Swollen face,mental dullness,dry skin,and loss of appetite are the characteristics of:

Match the given endocrine gland with its hormones,functions,and deficiency symptoms accurately.

Hyposecretion of which hormone is responsible for cretinism?

Given below are two statements: one is labelled as Assertion $(A)$ and the other is labelled as Reason $(R)$.
Assertion $(A):$ During pregnancy,the level of thyroxine is increased in the maternal blood.
Reason $(R):$ Pregnancy is characterised by metabolic changes in the mother.
In the light of the above statements,choose the most appropriate answer from the options given below:

Goiter is caused by the abnormal functioning of which gland?