Final answer:
Th type of cell that would be used in the adaptive immune response to the pathogen Helminth is 2) B cells.
Step-by-step explanation:
B cells play a crucial role in the adaptive immune response by producing antibodies that can specifically recognize and bind to antigens present on the surface of pathogens, such as Helminth. When a B cell encounters the antigen, it internalizes and processes it, then presents the antigen fragments on its surface in association with MHC class II molecules.
This complex can stimulate TH2 cells, which secrete cytokines that activate the B cell, leading to its proliferation and differentiation into plasma cells. The plasma cells secrete large amounts of specific antibodies that can neutralize the pathogen and facilitate its clearance by other immune cells. Therefore the correct answer is 2) B cells.