Fact 1: Lymphocytes are the key cells involved in the immune response.

Fact 2: An allergy attack is an immunal response.

Given the two facts above, answer the question "Lymphocytes are the key cells involved in what" with the following options: 
- Veins and arteries.
 - permineralization
 - the skin
 - Animal survival
 - allergy attack
 - positive
 - massive damage
 - critical organs


 

     allergy attack    