Progesterone hormone is secreted by : (A) Leydig cells (B) Sertoli cells (C) Corpus luteum (D) Pituitary gland
Progesterone hormone is secreted by : (A) Leydig cells (B) Sertoli cells (C) Corpus luteum (D) Pituitary gland

(c)Corpus luteum

Explanation: The endometrium thickens as a result of estradiol and progesterone released by the corpus luteum. The follicles produce both progesterone and estradiol.