Which of the following is NOT an accessory gland in the male reproductive system?

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Think about the difference between the organs that make sperm and the glands that add fluids to it. The testes are the male gonads where sperm are produced and testosterone is made, so they’re the primary reproductive organs. Accessory glands are the structures that secrete fluids to combine with sperm to form semen—these include the prostate gland, seminal vesicles, and bulbourethral glands. Because the question asks for what is not an accessory gland, the testes fit that description since they supply sperm and hormones rather than secreting the fluids that make up semen.