Answer the following question given this paragraph: 

A lymphocyte is the type of white blood cell involved in an immune system response. You can see what a lymphocyte looks like, greatly magnified, in Figure below . Lymphocytes make up about one quarter of all white blood cells, but there are trillions of them in the human body. Usually, fewer than half of the body’s lymphocytes are in the blood. The majority are in the lymph, lymph nodes, and lymph organs.


Q: A lymphocyte is the type of which cell involved in an immune system response?

 Choices:

- red blood cell

- white immunity cell

- white brain cell

- white blood cell

A:
white blood cell
