Final answer:
Mast cells can cause allergy symptoms and inflammation by degranulation. The correct answer is polymorphonuclear leukocytes.
Step-by-step explanation:
Mast cells are immune cells that can cause allergy symptoms and inflammation by degranulation. When mast cells encounter an allergen, they release the contents of their granules, which include inflammatory molecules such as histamine, leukotrienes, and prostaglandins. These molecules cause local tissue reactions, such as hives, and trigger an inflammatory response, leading to allergy symptoms.
In the context of the given options, the correct answer is D. polymorphonuclear leukocytes. Although dendritic cells, macrophages, and erythrocytes are all involved in the immune response, they do not degranulate and release inflammatory molecules like mast cells.