Final answer:
TH₂ cells are used in the adaptive immune response to stimulate B cells to produce antibodies against extracellular pathogens such as helminths.
Step-by-step explanation:
For the pathogen Helminth, the type of cell that would be used in the adaptive immune response is the TH₂ cells. TH₂ cells are predominantly responsible for stimulating naïve B cells to destroy foreign invaders through antibody production, which is crucial for combating extracellular pathogens such as helminths. Contrary to TH1 cells, which are inclined towards dealing with intracellular pathogens by enhancing the capabilities of macrophages, TH₂ cells focus on mobilizing B cells for the secretion of antibodies that target extracellular pathogens, which includes helminths.