Match List-I with List-II:

	List-I		List-I I
A	Menstruation	I	Fall in ovarian hormones
B	Proliferative phase	II	Peak levels of gonadotropins
C	Secretory phase	III	High levels of oestrogen and progesterone
D	Ovulation	IV	Raising levels of oestrogen and gonadotropins

Choose the correct answer from the options given below:

	A	B	C	D
1.	I	IV	II	III
2.	I	IV	III	II
3.	I	III	II	IV
4.	IV	III	II	I

A fall in ovarian hormones, especially progesterone, leads to menstruation.
Growing follicles secrete estrogen under the influence of gonadotropins (especially FSH) during the proliferative phase.
Oestrogen and progesterone are high in concentration during the secretory phase. They help in the build up of endometrium.
Ovulation occurs due to high levels of gonadotropins, especially LH.