What is the primary hormone produced in the ovaries?

The primary hormones produced in the ovaries are oestrogen and progesterone, making the answer encompassing both hormones correct. Oestrogen plays a crucial role in the development of female secondary sexual characteristics and the regulation of the menstrual cycle. It is involved in the maturation of eggs and the thickening of the uterine lining in preparation for a potential pregnancy.

Progesterone, on the other hand, is critical for maintaining the uterine lining after ovulation and during early pregnancy. It helps prepare the endometrium for implantation of a fertilized egg and supports the early stages of pregnancy.

Together, these hormones work synergistically to regulate various aspects of the reproductive system, especially in the menstrual cycle and pregnancy. Thus, the correct answer reflects the importance of both hormones in ovarian function.