The correct option is C Hypothalamus
Hunger and thirst are regulated by signals sent between the brain and body by a complex system of chemicals. The center for which triggers this in human beings is located at the hypothalamus. The cells of the hypothalamus communicates with the cells from other parts of the brain and thus forms a bridge between the nervous system and the endocrine system and regulates hormones in the body. Besides being responsible for hunger and thirst these the the hypothalamus also controls the body temperature.