(38) Following a rattle snake bite, a patient is injected with horse anti-rattlesnake venom serum. Ten days later he has general weakness, headaches, muscular and joint pains, and dark urine. Laboratory studies show proteinuria.   Serum concentrations of immunoglobulins are within the reference range, but serum C3 and C4 concentrations are decreased. Which of the following is the most likely pathological process? (A) Anaphylactic Reaction (B) Delayed Hypersensitivity to horse protei (C) Formation of antigen-antibody complexes containing horse proteins and human immunoglobulin (D) Formsation of antigen-antibody complexes containing snake venom proteins and a horse antibody (E) Systemic reaction to snake venom

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