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: Microbiology
[{'content': 'A 30 year old male, Kallu, with a history of sexual exposure comes with a painless indurated ulcer over the penis with eveed margins. The diagnosis is ? \nSelect and explain. \nA. Syphilis, B. Chancroid, C. Lymphogranuloma venerum, D. Granuloma inguinale', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Syphilis Painless indurated ulcer with eveed margins, h/o of sexual exposure and lack of systemic symptoms ours the diagnosis of syphilis.", 'role': 'assistant'}]