No brain activity is called?

• A. Brain death
• B. Functional death
• C. Whole-brain death
• D. Crystallized intelligence

Answer: (A)

Brain death is the best label because it specifically means an irreversible cessation of all brain activity, including the brainstem. In modern medicine, when there is no detectable brain function and no possibility of recovery, this state is legally and clinically considered death—even if heart function is mechanically maintained. The other terms don’t fit as precisely: functional death isn’t a standard medical term for the complete loss of brain activity; whole-brain death is sometimes used, but brain death is the widely accepted phrase; crystallized intelligence refers to accumulated knowledge and does not describe brain activity status.