The correct answer is option 4, Melanocyte. Melanocytes are not blood cells. They are specialized cells found in the skin, hair follicles, and eyes that produce a pigment called melanin, which is responsible for the color of our skin, hair, and eyes.

Option 1, Eosinophil, is a type of white blood cell that plays a role in allergic reactions and in defending against parasitic infections. Eosinophils are involved in the immune response.

Option 2, Lymphocyte, is another type of white blood cell and is an essential part of the immune system. Lymphocytes are responsible for recognizing and eliminating foreign substances and infected cells.

Option 3, Neutrophil, is the most abundant type of white blood cell in the human body. Neutrophils are involved in the initial response to infections and play a role in inflammation.

It`s important to note that while the provided answer is generally correct, it`s possible for certain circumstances or medical conditions to lead to abnormal findings, where different cell types may be present in the blood.