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: Medicine
Which one of the following is effective in the treatment of brucellosis - 
Select and explain. 
A. Rifampicin, B. Amphotericin, C. Ketoconazole, D. Pencillin
A: Rifampicin
Answer: A: Rifampicin 
Explanation: None