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: Pharmacology
[{'content': 'The drug that should be used for prophylaxis of close contacts of a patient suffering from meningococcal meningitis is : \nSelect and explain. \nA. Rifampicin, B. Dapsone, C. Erythromycin, D. Amikacin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]