<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .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 37.7C 99.9F, blood pressure 11070 mm Hg, pulse 74min, respiratory rate 20min, 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,  <response>: This is a clinical vignette describing a 16-year-old girl with a sore throat, fever, and lymphadenopathy concerning for possible streptococcal pharyngitis strep throat. The key findings are acute onset sore throat, fever, tonsillar swelling and anterior cervical lymphadenopathy. Rapid antigen detection test for group A strep rapid strep test would be the appropriate next step to determine if antibiotic therapy is indicated. Reassurance, ultrasound of lymph nodes, empiric antibiotics, and empiric antivirals would not be the best next steps.B: Rapid strep test 