You are presented with the question "What creates active immunity from a parasite?" and the following answer choices: 
- Cooking
 - memory cells
 - alpacas
 - peachleaf willow
 - Allergies
 - mammals
 - an organism's body
 - animals

Now knowing that active immunity results when an immune response to a pathogen produces memory cells and if the parasite causes harm, it is a pathogen, choose the best answer.


 

  memory cells       