Match the following columns and select the correct option:

Column - I	Column - II
(a) Ovary	(i) Human chorionic gonadotropin
(b) Placenta	(ii) Estrogen & Progesterone
(c) Corpus luteum	(iii) Androgens
(d) Leydig cells	(iv) Progesterone only

The correct option is D $\left(a\right)-\left(ii\right),\left(b\right)-\left(i\right),\left(c\right)-\left(iv\right),\left(d\right)-\left(iii\right)$
The growing ovarian follicles synthesize and secrete estrogen, a steroid hormone. This hormone plays a major role in the development of female sex organs and appearance of secondary sexual characters.

After ovulation, the ruptured Graafian follicle of the ovary transforms into corpus luteum. Corpus luteum is a temporary endocrine gland which secretes the hormone progesterone. Progesterone hormone maintains the endometrium of the uterus.

Hence, the ovary secretes estrogen and progesterone hormones. However, corpus luteum of the ovary secretes progesterone only.

hCG (human chorionic gonadotropin) is produced by the placenta in women only during pregnancy. It helps in maintaining the pregnancy.

Leydig cells or interstitial cells are present outside the seminiferous tubules of the testis in the interstitial spaces. They synthesize and secrete testicular hormones called androgens. The principal androgen is testosterone.

Androgens are a group of hormones that play a vital role in
development of secondary sexual characters. These also play a critical stimulatory role in the process of spermatogenesis.

Hence, option d is correct.