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The figure given below shows the sectional view of ovary. Select the option which gives correct identification of marked structure ( $A$ to $D$ ) and its feature.
$A:$ Primary follicle, it is also called gamete mother cell.
$B:$ Corpus luteum, it cannot be formed and added after birth.
$C:$ Grafian follicle, mature follicle which ruptures to release secondary oocyte.
$D:$ Tertiary follicle, a large number of this follicle degenerates during the phase from birth to puberty.
Solution
Oogonia are called as gamete mother cell. Corpus luteum is formed as a temporary endocrine structure after the ovulation. It is involved in the production of relatively high levels of progesterone and moderate levels of estradiol and inhibin A to maintain pregnancy. A large number of primary follicles degenerate during the phase from birth to puberty.
