The largest endocrine gland is:

The largest endocrine gland is:

Symptoms like pot-bellied,pigeon-like chest,protruding tongue,and mental retardation are characteristic of:

The hormone responsible for metamorphosis in a tadpole is

When is thyrocalcitonin secreted?

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: