The diagram illustrates what occurs in the body during active immunity. Pathogens gain entry into the body. W are recognised. Lymphocytes are activated. X kill pathogens directly. Pathogens are tagged so that they can be destroyed by Y. Z are made for long-term immunity. Which structures or cells represent W, X, Y and Z?
- Aantibodies: W; antigens: X; memory cells: Y; phagocytes: Z
- Bantibodies: W; antigens: X; memory cells: Z; phagocytes: Y
- Cantibodies: X; antigens: W; memory cells: Y; phagocytes: Z
- Dantibodies: X; antigens: W; memory cells: Z; phagocytes: Y