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The correct choice for the hormone responsible for stimulating gametogenesis in the human body is Follicle Stimulating Hormone (FSH). FSH plays a crucial role in the reproductive system, particularly in the regulation of the reproductive processes in both males and females.

In females, FSH is essential for the growth and maturation of ovarian follicles, which contain the eggs (ova). It stimulates the follicles to produce estrogen and promote the development of the oocytes, thus facilitating the process of gametogenesis.

In males, FSH contributes to spermatogenesis by acting on the Sertoli cells within the testes. These cells support the development of sperm from spermatogonia, thereby aiding in the production of mature sperm cells.

While other hormones mentioned, such as estrogen, luteinizing hormone, and testosterone, have significant roles in the reproductive system, they do not primarily initiate gametogenesis. Estrogen is primarily involved in the development of secondary sexual characteristics and the menstrual cycle, luteinizing hormone triggers ovulation and testosterone aids in the maturation of sperm, but FSH directly regulates the initial stages of gamete formation in both sexes.