Final answer:
Eosinophils, which are not expressly listed in the provided options, are the most effective at attacking parasitic pathogens such as tapeworms due to their ability to mediate immune responses against parasites.
Step-by-step explanation:
The type of cell that is most effective in attacking parasitic pathogens such as tapeworms is eosinophils. These cells are known for their ability to combat multicellular parasites. Eosinophils are a type of white blood cell containing cytoplasmic granules that help mediate immune responses against parasites. They play a critical role in the immune system by directly attacking parasitic worms. While macrophages and neutrophils are phagocytic cells that can engulf and digest pathogens, eosinophils are particularly adept at dealing with larger parasitic infections.