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 the causes of a non-healing corneal ulcer except: \nSelect and explain. \nA. Raised intraocular pressure, B. Associated iridocyclitis, C. Chronic dacryocystitis, D. Diabetes mellitus', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. Associated iridocyclitis', 'role': 'assistant'}]