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': 'In a patient who has come for dental extraction, having asthma,is on theophyllin you better avoid \nSelect and explain. \nA. Lignocaine, B. Azithromycin, C. Ciprofloxacin, D. Metronidazole', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]