Question 3
What does luteinising hormone bring about?
The right answer is the one marked above.
The Graafian follicle bursting and releasing the ovum. That happens at about day 14, and it is the hinge the whole cycle turns on.
Growing the follicle is FSH's work in the phase before. The secretory state of the uterine wall is brought about by progesterone, and the menstrual flow begins when progesterone falls — neither is LH.