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': 'Features of fungal ulcer : \nSelect and explain. \nA. Symptoms more than signs, B. Dry ulcer, C. Diffuse corneal edema, D. All', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Dry ulcer', 'role': 'assistant'}]