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Given below is an incomplete flow chart showing influence of hormones of gametogenesis in human females. $A, B, C$ and $D$ in the chart refers to
$\mathrm{A}-\mathrm{GnRH}$, (Gonadotropin Releasing Hormone), $B-$Oestrogen and progesterone, $C-$ Ovary, $D-FSH$ and $LH$
$\mathrm{A}-\mathrm{GnRH}$, (Gonadotropin Releasing Hormone), $B-$ Progesterone and $LH, C-$Ovary, $D-$ Oestrogen and $FSH$
$\mathrm{A}-\mathrm{GnRH}$, (Gonadotropin Releasing Hormone), $B-FSH$ and Oestrogen, $C-$Ovary, $D-LH$ and Progesterone
$A-GnRH$, (Gonadotropin Releasing Hormone), $B- FSH$ and $LH, C-$Ovary, $D- $Oestrogen and Progesterone
Solution
The $GnRH$ is secreted by hypothalamus which stimulates the anterior lobe of pituitary gland to secretes $LH$ and $FSH. FSH$, stimulates the growth of the ovarian follicles and also increases the development of egg/oocytes within the follicle to complete the meiosis$-I$ to form secondary oocyte. $FSH$ also stimulates the formation of oestrogens. $LH$ stimulates the corpus lutem to secretes progesterone. Rising level of progesterone inhibits the release of $G n R H$, which, in turn, inhibits the production of $FSH, LH$and progesterone
