This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory system, Subject name: Pharmacology
[{'content': 'Drugs which increase level of theophylline include: \nSelect and explain. \nA. chloramphenicol, B. Cimetidine, C. Allopurinol, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Drugs which inhibit theophylline metabolism and increase its plasma level are-erythromycin, ciprofloxacin, cimetidine, oral contraceptives,allopurinol, chloramphenicol- all enzyme inhibitors dose should be reduced to 2/3rds of the usual dose KD TRIPATHI Page No:227', 'role': 'assistant'}]