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': 'H. ducreyi causes \nSelect and explain. \nA. Gonorrhoea, B. Herpes, C. Chancroid, D. Granuloma venereum', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Chancroid', 'role': 'assistant'}]