Estrogen is the correct answer for a female sex hormone. Estrogen is produced primarily in the ovaries and plays a crucial role in the development and regulation of female reproductive organs and secondary sexual characteristics. It is responsible for the growth and maturation of the uterus, fallopian tubes, and breasts during puberty. Estrogen also regulates the menstrual cycle and is important for maintaining bone health.

Androgen, on the other hand, is a male sex hormone that includes testosterone. Androgens are responsible for the development and maintenance of male reproductive organs and secondary sexual characteristics.

Oxytocin is a hormone involved in various physiological processes, including childbirth and breastfeeding. However, it is not a female sex hormone.

Insulin is a hormone produced by the pancreas, and it`s involved in regulating glucose metabolism. It is not a female sex hormone.

Alert - correct answer should be .