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 treatment of contacts of meningococcal meningitis is by- \nSelect and explain. \nA. Rifampicin, B. Erythromycin, C. Penicillin, D. Cephalosporins', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i,e., Rifampicin", 'role': 'assistant'}]