Which layer of the uterus is responsible for parturition?

Which hormone inhibits the menstrual cycle in females during the period of lactation?

Sometimes the labor pains are less and uterine contractions have to be induced. What do you think the doctors inject to facilitate delivery?

What is the yellowish fluid produced during the initial days of lactation after parturition called?

On which layer of the uterus does oxytocin exert its maximum effect?

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: