When is the $LH$ surge observed during the menstrual cycle?

Which one of the following events is correctly matched with the time period in a normal menstrual cycle?

Given below is a flow chart showing ovarian changes during the menstrual cycle. Fill in the spaces by providing the names of the hormones responsible for the events shown.
$\boxed{\text{Primary follicles}}$
$\downarrow \leftarrow \boxed{A}$
$\boxed{\text{Graafian follicle}}$
$\downarrow \leftarrow \boxed{B}$
$\boxed{\text{Ovum}}$
$\downarrow \leftarrow \boxed{C}$
$\boxed{\text{Corpus luteum}}$

In women,the cessation of menstruation occurs at the age of:

What role do pituitary gonadotropins play during the follicular and ovulatory phases of the menstrual cycle? Explain the shifts in steroidal secretions.

Given below is an incomplete flow chart showing the influence of hormones on gametogenesis in human females. $A, B, C$ and $D$ in the chart refer to: