This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Pharmacology
[{'content': 'Oral contraceptives are not given with: \nSelect and explain. \nA. Streptomycin, B. Gresiofulvin, C. Pyraziniamide, D. Ethambutol', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Griseofulvin is an enzyme inducer which increases the metabolism of the oral contraceptives and thus causes its failure. (Ref.Essentials of medical pharmacology TD Tripathi 7th edition page no.326.)', 'role': 'assistant'}]