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': 'The most common variety of scleritis is: \nSelect and explain. \nA. Non-necrotizing anterior diffuse, B. Non-necrotizing anterior nodular, C. Anterior necrotizing with inflammation, D. Anterior necrotizing without inflammation', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. Non-necrotizing anterior diffuse', 'role': 'assistant'}]