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: Ophthalmology
[{'content': 'Drug of choice of trachoma is – \nSelect and explain. \nA. Penicillin, B. Sulfonamide, C. Tetracycline, D. Chloramphenicol', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Tetracycline or azithromycin are the drugs of choice for trachoma.\nOther drugs used are erythromycin, clarithromycin, rifampicin and sulfonamide.', 'role': 'assistant'}]