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': 'Species of Brucella acquired from contact with goats & sheeps - \nSelect and explain. \nA. B melitensis, B. B suis, C. B abartus, D. B canis', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., B melitensis * There are following four species of Brucellae1. Brucella melitensis# It is the commonest cause of symptomatic disease in humans.# It is the most virulent and invesive species.# It usually infect goats, sheeps and camel.2. Brucella suis# It is of intermediate virulence and primarily infects swin (pigs).3. Brucella abortus# It is of low virulence and primarily infects cattle or buffalo.4. Brucella canis# It infects dogs.", 'role': 'assistant'}]