A 23-year-old woman with bone marrow failure is treated with a large dose of rabbit antithymocyte globulin. Ten
days later, she develops fever, lymphadenopathy, arthralgias, and erythema on her hands and feet. Which of the
following is the most likely cause of these symptoms?
(A) Cytokine secretion by natural killer cells
(B) Eosinophil degranulation
© Immune complex deposition in tissues
(D) Polyclonal T-lymphocyte activation
(E) Widespread apoptosis of B lymphocytes