Answer:
Option (3).
Step-by-step explanation:
Hypothalamus is located at the base of a brain and divided into anterior, posterior and middle regions. These three regions work together to control the vital functions of the body.
Hypothalamus regulate the endocrine system, maintains homeostasis and control center of autonomic nervous system. Hypothalamus is not isolated and drugs abuse affects the hypothalamus region of the brain.
Thus, the correct answer is option (3).