The part of the brain that regulates body temperature, thirst and hunger, and controls the pituitary gland is the

Explanation

The hypothalamus is the meeting point of the nervous and endocrine systems: it monitors the temperature and water potential of the blood, generates thirst and hunger, and releases factors that control the anterior pituitary while making the hormones the posterior pituitary stores. Its small size is out of all proportion to its importance in homeostasis. The occipital lobe deals with vision alone.