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': 'Painful vaginal ulcer with inguinal lymphadenopathy and school of fish appearance of microorganism or microscopy are characteristic of: \nSelect and explain. \nA. Syphilis, B. LGV, C. Granuloma inguinale, D. Chancroid', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is. 'd' i. e., Chancroid", 'role': 'assistant'}]