Why is oxytocin called "birth hormone"?

Which hormone is called birth hormone in the female human beings?

Which hormone is also called degrowth hormone and Why?

These questions consist of two statements each,printed as Assertion and Reason.While asnwering these questions you are required to chose any one of the following four responses. If both Assertion and Reason are true and Reason in correct explanation of Assertion. If both assertion and Reason are true but reason is not correct explanation of Assertion. If Assertion is true but Reason is false. If both Assertion and Reason are false. Assertion:Oxytocin is a birth hormone and milk-forming hormone. Reason:Oxytocin is secreted from posterior lobe of pituitary gland and controls the contraction of uterine muscles at the time of implantation.

Give the reason for the following statements : Progesterone is commonly called antiabortion hormone.

Give the reason for the following statements : Epinephrine is commonly called triple-F hormone.

Why transistor is so called?