This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteriology, Subject name: Anatomy
[{'content': 'The drug of choice for chemoprophylaxis for H.influenzae is \nSelect and explain. \nA. Rifampin, B. Ceftriaxone, C. Penicillin, D. Erythromycin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Oral rifampin is the drug of choice', 'role': 'assistant'}]