Which of the following is NOT a means by which type II hypersensitivity reactions occur?
A. IgE binding to FceRI on mast cells
B. IgM binding to cell-surface antigens, leading to complement fixation on the cell surface
C. Cytotoxic cells with Fc receptors for antibodies bound to the surface of a cell, leading to cytotoxic killing
D. Antibody-antigen complexes that form opsonins, leading to phagocyte-driven cell killing
E. All of the above are associated with type II hypersensitivity reactions.
Answer: A