Which of the following is NOT a function of the testes?

The correct response is identified as producing eggs, which is not a function of the testes. The testes are specifically male reproductive organs, and their primary roles include the production of sperm and the secretion of male sex hormones, such as testosterone. Additionally, the testes also have a role in storing sperm until it is matured and ready for ejaculation.

In contrast, the process of producing eggs is a function of the ovaries, which are the female reproductive organs. Thus, understanding the roles of these different reproductive systems clarifies why the production of eggs does not fall under the functions of the testes.