This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Conjunctiva, 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. Other drugs used are erythromycin, clarithromycin, rifamipicin and sulfonamide. Ref: Parson's 22nd/e p.175 & 21st/e p. 174", 'role': 'assistant'}]