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': 'An organism is found to be a pleomorphic, gram-negative rod that causes a localized skin infection and seems to be a cause of an occupational disease of fishermen, fish handlers, and butchers. Most likely organism is: \nSelect and explain. \nA. Erysipelothrix, B. Brucella, C. Salmonella, D. Leptospira', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Erysipelothrix', 'role': 'assistant'}]