Answer the following question given this paragraph: 

The pineal gland is a tiny gland located at the base of the brain. It secretes the hormone melatonin. This hormone controls sleep-wake cycles and several other processes.


Q: What gland is located at the base of the brain and secretes the hormone melatonin?

 Choices:

- thymus

- pituitary

- thyroid

- pineal

A:
pineal
