Answer:
Brain stem
Step-by-step explanation:
Brain stem is a stem-like structure. It is a part of the base of the brain which is joined to the spinal cord.
Brain stem includes midbrain, pons, and medulla oblongata It controls essential functions of the body which are important for the life.
The important functions of the human body controlled by brainstem are breathing, swallowing, heart rate, blood pressure, consciousness.
Therefore, damage of the brain stem would be the most life-threatening.