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': 'A farmer rearing sheep, presented with complaints of fever and weakness for the last one month. There is generalised lymphadenopathy. There was also associated hepatomegaly. Biopsy of liver showed non caseating granuloma. These are most likely due to infection with - \nSelect and explain. \nA. Yersinia pestis, B. Brucella Canis, C. Francisella tularensis, D. Brucella melitensis', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]