Which is NOT a function of testosterone?

Explanation

Testosterone's primary functions include promoting sperm production and regulating hormones such as FSH. It significantly stimulates spermatogenesis, which is the process of sperm cell formation. The other options either describe roles that testosterone does not primarily serve or misrepresent its functions. For instance, while testosterone can influence FSH levels, it is not the hormone that primarily inhibits it; that role belongs to inhibin. Additionally, testosterone is essential for sperm production, making the statement about limiting spermatogenesis the only false option in this context.