Which gland in males lies under the urinary bladder and surrounds the urethra?

The prostate gland is the correct answer because it is specifically located under the urinary bladder and encircles the urethra in males. This anatomical positioning is critical for its function, as the prostate plays a significant role in the male reproductive system by producing fluid that nourishes and transports sperm. Additionally, its surrounding placement helps regulate the flow of urine and semen through the urethra, assisting in the male reproductive process and urinary control.

The other glands listed are all located in different regions of the body and serve different functions. For example, the thyroid gland is found in the neck and regulates metabolism, while the adrenal glands are situated atop the kidneys and are involved in stress response and hormone production. The pituitary gland is located at the base of the brain and is often referred to as the "master gland" due to its role in regulating various other endocrine glands throughout the body. These differences highlight the unique function and location of the prostate gland in relation to the urinary system and male reproductive health.