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': '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. There 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: Ans. is 'd' i.e., Brucella melitensis(Ref: Harrison, 19th/e, p. 1066 and Ananthanarayan, 9th/e, p. 339)Most common focal feature of brucellosis is musculoskeletal pain.Classic triad of fever - Profuse night sweating, arthralgia/arthritis and Hepatosplenomegaly are present in most patients.History of contact with animal followed by fever, lymphadenopathy and formation of non-caseating granuloma are features of brucellosis.", 'role': 'assistant'}]