<prompt> A young man presents to the emergency department with a maculopapular rash 2 weeks after healing of a painless genital ulcer. The most likely etiological agent isTreponema PallidumTreponema PertenueChalmydia TrachomatisNone of the above  <response>: Development of maculopapular rash two weeks after having a painless genital ulcerprobably chancre suggests a diagnosis of secondary syphilis caused by Treponema.pallidum 