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': 'OCP fail when used with any of the following except: \nSelect and explain. \nA. Ethoxsuccimide, B. Phenytoin, C. Rifampin, D. Tetracycline', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Tetracycline', 'role': 'assistant'}]