The activity of formation of milk is regulated by the activity of $A$. While the ejection of milk is controlled by $B$ hormone. Here,$A$ and $B$ refers to:

Continued secretion of milk is maintained by

Which hormone stimulates the secretion of milk during the sucking of milk by a baby?

Which of these is not an important component of the initiation of parturition in humans?

Given below are two statements: One is labelled as Assertion $A$ and the other is labelled as Reason $R$ :
Assertion $A$ : Breast-feeding during the initial period of infant growth is recommended by doctors for bringing up a healthy baby.
Reason $R$ : Colostrum contains several antibodies absolutely essential to develop resistance in the newborn baby.
In the light of the above statements,choose the most appropriate answer from the options given below:

The signals for parturition originate from which of the following?