You are presented with the question "P16 is an example of what type of thing that causes cancer when it stops functiong properly?" and the following answer choices: 
- Toxins
 - edema
 - gene
 - ferns
 - CO 2
 - PDAs
 - HIV
 - albino

Now knowing that cancer is a disease that occurs when the cell cycle is no longer regulated and p16 is a regulator of the cell division cycle, choose the best answer.


 

   gene      