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: Medicine
[{'content': 'A 30-year-old male, Kallu, with a history of sexual exposure comes with a painless indurated ulcer over the penis with everted margins. The diagnosis is \nSelect and explain. \nA. Syphilis, B. Chancroid, C. Lymphogranuloma venerum, D. Granuloma inguinale', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]