This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteriology, Subject name: Anatomy
[{'content': 'Agent of Chancroid is \nSelect and explain. \nA. H.influenzae, B. H.aegyptius, C. H.ducreyi, D. H.haemolyticus', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Chancroid is an STD that presents as a genital ulcer. It is caused by H.ducreyi', 'role': 'assistant'}]