The hormone _________ assists estrogen in stimulating the formation of the endometrium.

Progesterone is a hormone produced by the ovaries and is responsible for maintaining the uterine lining, or endometrium.
Oxytocin is a hormone that is involved with the processes of childbirth and milk production and is released by the pituitary gland.
Luteinizing hormone is also an important hormone for the female reproductive system; however, it is not involved with the formation or maintenance of the endometrium. Instead, it stimulates ovulation along with estrogen. It is also not produced by the reproductive organs but by the pituitary gland in the brain.
Testosterone is the primary male reproductive hormone, however, it is produced in smaller amounts by the ovaries in women. The role of testosterone in women is to regulate libido, body composition, and muscular strength.