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': 'All are complications of ulcerative blepharitis except: \nSelect and explain. \nA. Poliosis, B. Madarosis, C. Tylosis, D. Trichiasis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Poliosis', 'role': 'assistant'}]