Which of the following hormones stimulates milk secretion in females?

$A$: Corticotrophin-releasing hormone is a part of the clock that establishes the timing of birth.
$R$: The signals for parturition originate from the fully developed foetus and placenta,which induce mild uterine contractions called the foetal ejection reflex.

The contraction of the uterus at the time of childbirth is stimulated by $........$.

Assertion : Mammary glands are apocrine glands.
Reason : The distal part containing secretory granules breaks down and leaves as a secretion.

Foetal ejection reflex in human female is accelerated by

Lactational amenorrhoea is: