Which of the following is classified as a granulocyte in the immune system?

• A. Monocyte
• B. Neutrophil
• C. Lymphocyte
• D. Macrophage

Answer: (B)

Verified step by step guidance

1. Understand that granulocytes are a category of white blood cells characterized by the presence of granules in their cytoplasm, which contain enzymes important for immune responses.
2. Recall the three main types of granulocytes: neutrophils, eosinophils, and basophils, all of which play roles in innate immunity and inflammation.
3. Identify that monocytes and macrophages are agranulocytes, meaning they lack visible granules and are part of the mononuclear phagocyte system.
4. Recognize that lymphocytes (such as B cells and T cells) are also agranulocytes involved primarily in adaptive immunity.
5. Conclude that among the options given, neutrophils are the only granulocytes, making them the correct classification.