Which of the following organs is NOT part of the male reproductive system?

The ovaries are the correct answer because they are exclusively part of the female reproductive system. Ovaries are responsible for producing eggs and hormones like estrogen and progesterone, which are essential for female reproductive functions. In contrast, the testes, epididymis, and vas deferens are integral components of the male reproductive system. The testes produce sperm and testosterone, the epididymis stores and matures sperm, and the vas deferens transports sperm from the epididymis to the ejaculatory duct. Recognizing the specific roles and locations of these organs helps in understanding the distinct structures and functions of male and female reproductive systems.