A 4-year-old boy is brought to the physician by his mother for a 1-day history of dark urine. 1 week ago he had the appearance of some lesions on his face. The immunologic mechanism responsible for the patient’s urinary findings is most similar to which of the following?
Arthus reaction
Contact dermatitis
Graves disease
Heparin-induced thrombocytopenia
Hives
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