The following are multiple choice questions (with answers) about medical knowledge.   **Question:** An 18-year-old woman comes to the physician because of a pruritic rash on her back for the past 2 hours. This morning, she started a course of ceftriaxone for treatment of pyelonephritis. A photograph of the rash is shown. This patient's skin findings are most likely associated with which of the following?   (A) Direct tissue damage by irradiated antibiotic agent   (B) Cytotoxic T-cell destruction of antigen-tagged cells   (C) Hyperpermeability of superficial dermal microvasculature   (D) Mast cell activation in subcutaneous tissues
['(C) Hyperpermeability of superficial dermal microvasculature <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Direct tissue damage by irradiated antibiotic agent \n (B) Cytotoxic T-cell destruction of antigen-tagged cells \n (C) Hyperpermeability of superficial dermal microvasculature \n (D) Mast cell activation in subcutaneous tissues <> possible answers', "  An 18-year-old woman comes to the physician because of a pruritic rash on her back for the past 2 hours. This morning, she started a course of ceftriaxone for treatment of pyelonephritis. A photograph of the rash is shown. This patient's skin findings are most likely associated with which of the following? <> context@"]