This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Brucella, Subject name: Microbiology
[{'content': 'Brucella abortus primarily affects - \nSelect and explain. \nA. Dog, B. Cattle, C. Swine, D. Goat', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Cattle o Human brucellosis is a zoonosis, acquired from animals directly or indirectly. The animals that commonly act as sources:Sheep, goat ami camel -Br. melitensisCattle or Buffalo-Br. abortusSwine-Br. suisDog-Br. Canis", 'role': 'assistant'}]