Step 1: Understanding the role of FSH.
Follicle Stimulating Hormone (FSH) is secreted by the anterior pituitary gland and plays a crucial role in reproduction.
Step 2: Role of FSH in males and females.
In males, FSH stimulates spermatogenesis in the seminiferous tubules.
In females, FSH stimulates the development of ovarian follicles and estrogen secretion.
Step 3: Conclusion.
Deficiency of FSH disrupts gamete formation in both sexes, leading to infertility. Hence, the correct answer is (B) FSH.