Option D is correct becose i will eliminate one by one option oestrogen play major role develepe ment of female sex organs and maintenance the carpus lutium , prolactin play major role in milk formation, luteinizing hormone play major role in L. H surge, F. S.H mains graffian follicle in females, spermatogenesis in males.

Maintaining Graafian Follicle

Graafian follicle is a structure in the ovary that contains an immature egg. It is responsible for the production of hormones that are important in the menstrual cycle. The maintenance of the Graafian follicle is due to the activity of several hormones, including:

Follicle Stimulating Hormone (FSH)

FSH is a hormone produced by the pituitary gland. It stimulates the growth and development of the Graafian follicle. FSH binds to receptors on the surface of the follicle cells, causing them to divide and grow. As the follicle grows, it produces more estrogen.

Estrogen

Estrogen is a female hormone produced by the Graafian follicle. It plays a critical role in the menstrual cycle by regulating the growth and development of the endometrium. Estrogen also promotes the growth of the follicle, which produces more estrogen in a positive feedback loop.

Luteinizing Hormone (LH)

LH is a hormone produced by the pituitary gland. It triggers ovulation by causing the Graafian follicle to rupture and release the mature egg. LH also stimulates the production of progesterone.

Progesterone

Progesterone is a hormone produced by the corpus luteum, which is formed after ovulation. It prepares the endometrium for implantation and maintains pregnancy if fertilization occurs. Progesterone also inhibits the production of FSH and LH, preventing the development of new follicles.

Conclusion

The Graafian follicle is critical for the production of female hormones and the menstrual cycle. Its maintenance is due to the activity of FSH, estrogen, LH, and progesterone. These hormones work together in a complex feedback loop to ensure the proper growth and development of the follicle.