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': 'Which of the following is/are caused by trachoma: \nSelect and explain. \nA. Entropion, B. Ectropion, C. Pinguecula, D. All', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A. i.e. Entropion', 'role': 'assistant'}]