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

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:

Which substance is responsible for metamorphosis in amphibians?

Which of the following glands is associated with the consumption of iodized salt?

Toxic agents present in food which interfere with thyroxine synthesis lead to the development of

Which of the following is referred to as the "suicide gland"?