question: Q:A 16-year-old girl presents with a sore throat. The patient says symptoms onset acutely 3 days ago and have progressively worsened. She denies any history of cough, nasal congestion or rhinorrhea. No significant past medical history or current medications. The vital signs include: temperature 37.7°C (99.9°F), blood pressure 110/70 mm Hg, pulse 74/min, respiratory rate 20/min, and oxygen saturation 99% on room air. Physical examination is significant for anterior cervical lymphadenopathy. There is edema of the oropharynx and tonsillar swelling but no tonsillar exudate. Which of the following is the next best step in management?? 
  {'A': 'Reassurance', 'B': 'Rapid strep test', 'C': 'Ultrasound of the anterior cervical lymph nodes', 'D': 'Empiric treatment with antibiotics', 'E': 'Empiric treatment with antivirals'},