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
Oral contraceptives are not given with: 
Select and explain. 
A. Streptomycin, B. Gresiofulvin, C. Pyraziniamide, D. Ethambutol
B: Gresiofulvin
Answer: B: Gresiofulvin 
Explanation: 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.)