You are presented with the question "What targets cells that grow out of control?" and the following answer choices: 
- smoking cigarettes
 - Other cells
 - radiation
 - killing insects
 - The brain
 - massive damage
 - Bacteria
 - Chemotherapy

Now knowing that cancer cells divide more often than normal cells, and grow out of control and chemotherapy and radiotherapy target the rapidly dividing cancer cells, choose the best answer.


 

        Chemotherapy 