Answer:
The correct answer will be option C (Hypothalamus).
Explanation:
Hypothalamus is a region of brain located at the base of brain near the pituitary gland. Its size is almost the size of almond.
Hypothalamus plays important roles in governing biological functions such as hunger,thirst,mood, sleep, body temperature by the production of hormones which regulate neurotransmitters like serotonin and epinephrine which gives feeling of satiety or fullness after eating.
thus, option C is the correct answer.