You are presented with the question "Lymphocytes are the key cells involved in what?" and the following answer choices: 
- dog attacks
 - major threat to health
 - survival
 - Animal survival
 - cat petting
 - animal adoption
 - allergy attacks
 - critical organs

Now knowing that lymphocytes are the key cells involved in the immune response and an allergy attack is an immunal response, choose the best answer.


 

       allergy attacks  