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: Social & Preventive Medicine
[{'content': 'What is the recommended drug of treatment for brucellosis? \nSelect and explain. \nA. Tetracycline, B. Doxycycline, C. Erythromycin, D. Azithromycin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The drug of choice for treatment of human brucellosis is tetracycline. Ref: Park 21st edition, page 266.', 'role': 'assistant'}]