Which of the following is not a type of white blood cell?

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Platelets are not a type of white blood cell but are important to maintaining the health of an organism. Platelets are necessary for blood clotting to prevent excessive bleeding.
There are 5 types of white blood cells or leukocytes. These include:
Neutrophils make up roughly half of all white blood cells and are usually the first cells to become active during the immune response.
Monocytes make up about 5% of our total white blood cell content and are responsible for cleaning up debris and dead cells.
Eosinophils make up only small percentage of white blood cells and are most responsive to allergens. They also have important immune functions for resistance to bacteria and parasites.
Lymphocytes are the white blood cells that are primarily responsible for creating antibodies. When our body is first exposed to a pathogen, lymphocytes can create an antibody that will allow recognition of this pathogen if exposed a second time.
Basophils are active in both allergen and inflammatory responses. They contain histamine which increases blood flow, and heparin which prevents blood clotting.
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Which of the Following Is Not a Type of White