You are presented with the question "What die quickly if a stroke occurs?" and the following answer choices: 
- a fish
 - animals
 - brain cells
 - organs
 - critical organs
 - protons
 - neutrons
 - bones

Now knowing that brain cells die quickly if their oxygen supply is cut off and if the oxygen supply to the brain is cut off, a stroke can occur, choose the best answer.


 

   brain cells      