Q. A 22-year-old woman presents to the primary care clinic with complaint of a painless ulcer on her external genitalia. She reports that the ulcer appeared about three weeks ago and has not changed in size. She has been sexually active with multiple partners and rarely uses protection. On physical examination, the physician has observed a single, round, firm, and non-tender ulcer measuring approximately 1 cm in diameter. There is no adenopathy. A rapid plasma reagin (RPR) test returns positive, and a confirmatory fluorescent treponemal antibody absorption (FTA-ABS) test is also positive. What is the most appropriate treatment for this patient’s condition?