A 35-year-old woman presents to clinic with a slightly itchy rash involving her extremities and trunk that began about 1 day ago. She has not treated the rash with anything. She does not recall any recent upper respiratory or gastrointestinal symptoms but does report that she started cephalexin 8 days ago for a urinary tract infection. On exam, there is no facial involvement, lymphadenopathy, or mucous membrane involvement. She appears well. A complete blood count and complete metabolic panel are both normal.

What is the diagnosis?
A. Drug hypersensitivity syndrome
B. Viral exanthem
C. Scabies
D. Urticaria
E. Exanthematous drug eruption

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