Q: What are the key cells in the immune response?


Read this paragraph and choose the correct option from the provided answers:

Lymphocytes are the key cells in the immune response. They are leukocytes that become activated by a particular antigen. There are two major type of lymphocytes: B cells and T cells.

 Choices:

- keratinocytes

- erythrocytes

- leukocytes

- lymphocytes


A:
lymphocytes