Which type of death is defined by no brain activity?

• A. Clinical death
• B. Brain death
• C. Biological death
• D. Social death

Answer: (B)

No brain activity is the defining mark of brain death. It means the brain, including the brainstem, has irreversibly stopped functioning. Even if artificial support keeps the heart beating, the person is considered dead because the body can no longer maintain integrated life processes without brain activity. This distinguishes it from clinical death, where breathing and circulation have stopped but may be restored with intervention. Social death is about social status or relationships, not a medical state, and biological death refers to the broader end of vital bodily functions. Understanding this helps you see why the absence of brain activity is the specific criterion that defines brain death.