question: Q:A 23-year-old woman presented to the clinic for her first prenatal appointment with fatigue and pain in the perineum for the past 8 days. The past medical history is benign and she claimed to have only had unprotected intercourse with her husband. She had a documented allergic reaction to amoxicillin 2 years ago. The vaginal speculum exam revealed a clean, ulcerated genital lesion, which was tender and non-exudative. No lymphadenopathy was detected. A rapid plasma reagin (RPR) test revealed a titer of 1:64 and the fluorescent treponemal antibody absorption (FTA- abs) test was positive. What is the next best step in the management of this patient?? 
  {'A': 'Parenteral ceftriaxone, 1 g x 10 days', 'B': 'Penicillin desensitization, then intramuscular benzathine penicillin, G 2.4 million units', 'C': 'Oral tetracycline, 500 mg 4 times daily x 1 week', 'D': 'Doxycycline, 100 mg twice daily x 14 days', 'E': 'Delay treatment until delivery'},