Which of the following statements are correct with respect to hormones involved in the reproductive cycle of human females?
a. Both LH and FSH attain a peak level in the middle of cycle.
b. Estrogen is essential for the maintenance of the endometrium.
c. Uterine endometrium proliferates in presence of ovarian hormone.
d. LH surge induces rupture of Graafian follicle.
[0.7 mark]