Final answer:
The correct answer to the question is E) Testis, which is the male gonad responsible for producing sperm and the hormone testosterone.
Step-by-step explanation:
The male gonad is called the testis. In the male reproductive system, the testes serve as the gonads, producing not only sperm (male gametes) but also the hormone testosterone.
The epididymis is a coiled structure resting atop each testis, with the primary function of maturing and storing sperm. The scrotum is the muscular sac that holds the testes outside of the body cavity to maintain an optimal temperature for spermatogenesis, which occurs within the seminiferous tubules of the testes. Therefore, the correct answer from the given options is E) Testis.