Question

which type of white blood cell stains red and helps to lessen an allergic reaction?
a lymphocyte
b eosinophil
c basophil
d monocyte

Explanation:

• Lymphocyte: Mainly involved in immune responses like antibody production (B - lymphocytes) and cell - mediated immunity (T - lymphocytes), not specifically in staining red and lessening allergic reactions.
• Eosinophil: Stains red with eosin dye. It releases enzymes that counteract inflammatory substances in allergic reactions.
• Basophil: Stains blue - black with basic dyes. It releases histamine (pro - inflammatory in allergic reactions), not to lessen them.
• Monocyte: Differentiates into macrophages. Involved in phagocytosis of pathogens and debris, not in the described staining and allergic reaction - lessening role.

Answer:

B. Eosinophil