In males, what structure is responsible for producing sperm?

The correct answer is the testes. The testes are the male reproductive organs responsible for producing sperm through a process called spermatogenesis. Located in the scrotum, the testes maintain a temperature slightly lower than the body's core temperature, which is essential for the proper production and maturation of sperm.

While other structures mentioned play important roles in the male reproductive system, they do not produce sperm. The prostate, for example, contributes to seminal fluid but does not create sperm itself. The epididymis is where sperm mature and are stored after being produced in the testes, but it doesn’t produce them. The urethra serves as a passageway for urine and sperm to exit the body but is not involved in sperm production. Understanding these distinctions is crucial for comprehending male reproductive anatomy and physiology.