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': 'All are true about rifampicin except : \nSelect and explain. \nA. Microsomal enzyme inducer, B. Used in treatment of meningiococcal meningitis, C. May cause OCP failure, D. Bactericidal in nature', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]