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': 'Fever of unknown origin in a farmer who raises goats would most likely be caused by which of the following organisms? \nSelect and explain. \nA. Brucella melitensis, B. Clostridium novyi, C. T. pallidum, D. Histoplasma capsulatum', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Brucella are small, aerobic, Gram-negative coccobacilli. Of the four well-characterized species of Brucella, only one-B. melitensis-characteristically infects both goats and humans. Brucellosis may be associated with gastrointestinal and neurologic symptoms, lymphadenopathy, splenomegaly, hepatitis, and osteomyelitis.', 'role': 'assistant'}]