In the context of female reproductive health, what does F.S.H. promote?

Follicle Stimulating Hormone (F.S.H.) plays a crucial role in female reproductive health primarily by promoting ovarian follicle maturation. It is secreted by the anterior pituitary gland and is essential for the growth and development of ovarian follicles. This process involves the stimulation of the ovaries, leading to the maturation of eggs for ovulation and the production of estrogen by the growing follicles. By fostering this maturation process, F.S.H. is fundamental to the menstrual cycle and overall fertility in females.

The other options relate to different physiological processes. For example, while uterine contraction is influenced by hormones like oxytocin, mammary gland development is mainly regulated by hormones such as prolactin and estrogen. Menstrual flow regulation also involves a complex interplay of various hormones, predominantly progesterone and estrogen, rather than F.S.H. Thus, the primary and most accurate function of F.S.H. is indeed the promotion of ovarian follicle maturation.