This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Chemotherapy: General Principles, Subject name: Pharmacology
[{'content': 'Ciprofloxacin should not be given to an asthmatic using theophylline because: \nSelect and explain. \nA. Ciprofloxacin inhibits theophylline metabolism, B. Theophylline inhibits ciprofloxacin metabolism, C. Ciprofloxacin decreases effect of theophylline, D. Theophylline induces metabolism of ciprofloxacin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (A) Ciprofloxacin inhibits theophylline metabolism(Ref: KDT 8/e p761)Theophylline has a narrow margin of safety (low therapeutic index) Ciprofloxacin inhibits theophylline metabolism and increases its plasma level leading to toxicity. Thus, ciprofloxacin should not be given to an asthmatic using theophylline.', 'role': 'assistant'}]