What structure is responsible for the production of sperm in males?

The testes are the primary male reproductive organs responsible for the production of sperm. Within the testes, there are specialized structures called seminiferous tubules where spermatogenesis occurs. This process involves the division and maturation of germ cells into spermatozoa. The testes also produce testosterone, which plays a crucial role in the development of male secondary sexual characteristics and the regulation of many aspects of male reproductive function.

In contrast, the other structures mentioned have different functions. The vas deferens is a tube that transports sperm from the testes to the urethra. The prostate gland produces seminal fluid that nourishes and transports sperm, but it does not produce sperm itself. Similarly, the seminal vesicles also produce fluid that contributes to seminal fluid but are not involved in sperm production. Thus, the testes are the definitive answer as they are the site where sperm is actually produced.