question: Q:A 3-year-old boy is brought to the emergency department after the sudden onset of a rash that started on the head and progressed to the trunk and extremities. Over the past week, he has had a runny nose, a cough, and red, crusty eyes. He recently immigrated with his family from Yemen and immunization records are unavailable. The patient appears malnourished. His temperature is 40.0°C (104°F). Examination shows generalized lymphadenopathy and a blanching, partially confluent maculopapular exanthema. Administration of which of the following is most likely to improve this patient's condition?? 
  {'A': 'Valacyclovir', 'B': 'Penicillin V', 'C': 'Retinol', 'D': 'Live-attenuated vaccine', 'E': 'Intravenous immunoglobulin'},