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
Brucella abortus primarily affects - 
Select and explain. 
A. Dog, B. Cattle, C. Swine, D. Goat
B: Cattle
Answer: B: Cattle 
Explanation: 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