Which hormone regulates the human menstrual cycle?

In a $28$-day human ovarian cycle,ovulation occurs on:

Categorize the following animals into those exhibiting menstrual cycle and those exhibiting oestrous cycle.
$I -$ Monkeys,$II -$ Cows,$III -$ Sheep,$IV -$ Apes,$V -$ Humans,$VI -$ Rats,$VII -$ Deer,$VIII -$ Dogs,$IX -$ Tigers
$\text{Menstrual cycle} \quad \quad \quad \text{Oestrous cycle}$

In girls, the first menstruation begins at puberty and is called .....

$A$ decrease in the level of oestrogen and progesterone causes:

Which period of days is known as the secretory phase in the menstrual cycle?