Within minutes of a bee sting, a
23-year-old woman develops generalized
pruritus and hyperemia of the skin, followed shortly by swelling of the face and eyelids, dyspnea, and laryngeal edema. This reaction is mediated by :

A 20-year-old woman presents with malar
rash, arthralgias, low-grade fever, and high
titer antibodies to double-stranded DNA Which of the following forms of hypersensitivity is the primary mechanism of the abnormalities found in this disorder?