Answer the following question given this paragraph: 

The prostate gland secretes a fluid that mixes with sperm to help form semen. The prostate gland is located beneath the bladder. Semen is a "milky" liquid that carries sperm through the urethra and out of the body. In addition to sperm cells, semen contains sugars (fructose) which provide energy to the sperm cells, and enzymes and other substances which help the sperm survive.


Q: The prostate gland secretes a fluid that mixes with sperm to help form what?

 Choices:

- testosterone

- hormone

- urine

- semen

A:
semen
