This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteria, Subject name: Microbiology
[{'content': 'School of fish appearance is characteristic of - \nSelect and explain. \nA. Bordetella pertussis, B. Yersinia enterocolitica, C. Haemophillus ducreyi, D. Legionella', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. is \'c\' i.e., Haemophillus ducreyi* H duceryi is Gram negative but often may appear Gram positive and frequently shows bipolar staining.* The bacilli may be arranged in small groups or whorls or in parallel chains giving a "school offish" or "rail road track appearance".', 'role': 'assistant'}]