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: Skin
[{'content': 'School of fish appearance is shown by: \nSelect and explain. \nA. Hemophilus ducreyi, B. Gonococcus, C. Chlamydia, D. Donovania granulomatis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Hemophilus ducreyi', 'role': 'assistant'}]