This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Dental
[{'content': '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 is – \nSelect and explain. \nA. Treponema Pallidum, B. Treponema Pertenue, C. Chalmydia Trachomatis, D. None of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Development of maculopapular rash two weeks after having a painless genital ulcer(probably chancre)\xa0suggests a diagnosis of secondary syphilis caused by Treponema.pallidum', 'role': 'assistant'}]