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': 'Malta fever is caused by - \nSelect and explain. \nA. Treponema pallidum, B. Borrelia burgdorferi, C. Brucella melitensis, D. Pseudomonas aeruginosa', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]