The correct option is C Assertion is correct but Reason is incorrect
The estrogen is synthesised and secreted mainly by the growing ovarian
follicles. Menopause is the time in a woman's life when the ovaries
cease to produce an egg every month. Therefore, menstruation ceases
gradually. During this condition ovaries fail to respond or may be
resisted to FSH. In this case, FSH level is very high and the estrogen
level is very low. This may happen because both the ovaries, by
menopause, have run out of ovarian follicles. So, menopause may begin
when no follicles are left in the ovaries. Without developing follicles,
there is a reduced supply of estrogen and progesterone. Assertion is correct but Reason is incorrect.