This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Sexually transmitted diseases, Subject name: Dental
A young man presents to the emergency depament with a maculopapular rash 2 weeks after healing of a painless genital ulcer. The most likely etiological agent is - 
Select and explain. 
A. Treponema Pallidum, B. Treponema Peunae, C. Chalmydia Trachomatis, D. Chalmydia Trachomatis
A: Treponema Pallidum
Answer: A: Treponema Pallidum 
Explanation: Syphilis causes genital ulcers and cutaneous lesion of any morphology( macular, papular, papulosquamous, nodular ) but is never vehicular or Bullous. Causative agent of syphilis is Treponema pallidum. From illustrated synopsis of dermatology and sexually transmitted diseases neena khanna 5th edition page no 320