A 30-year-old woman presents to her primary care physician with concerns that she has been exposed to syphilis by her partner. She was treated for syphilis in the past. Which of the following diagnostic tools would show a false-positive result due to her prior infection and cannot be used alone to provide a diagnosis of syphilis?ADirect fluorescent antibody (DFA)BFluorescent treponemal antibody absorption (FTA-ABS)CPolymerase chain reaction (PCR)DRapid plasma reagin (RPR)Which of the following can cause a false positive rapid plasma reagin (RPR)?

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