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': '"Safe strategy" has been developed for the control of: \nSelect and explain. \nA. Conjunctivitis, B. Trachoma, C. Refractive error, D. Ocular trauma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. Trachoma', 'role': 'assistant'}]