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
Organism most likely to cause "fever of unknown origin" in a farmer who raises goats - 
Select and explain. 
A. Brucella melitensis, B. Clostridium novyi, C. Histoplasma capsulatum, D. Mycobacterium tuberculosis
A: Brucella melitensis
Answer: A: Brucella melitensis 
Explanation: Brucella melitensis infection is acquired from goat sheep and camels.