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: Surgery
[{'content': 'Recommended adult prophylaxis for meningococcal infection is; \nSelect and explain. \nA. Rifampicin 600 mg twice daily for 2 days, B. Ampicillin Ig daily for 5 days, C. Tetracycline 2 g daily for 1 day, D. Chloramphenicol 2 g daily for 2 days', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Rifampicin 600 mg twice daily for 2 days * Recommended adult prophylaxis for meningococcal meningitis is rifampicin 600 mg twice daily for 2 days. Chemoprophylaxis is recommended for close contacts of persons with meningococcal disease.', 'role': 'assistant'}]