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 of the following are features of episcleritis except: \nSelect and explain. \nA. Redness, B. Marked pain, C. Photophobia, D. Lacrimation', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. Marked pain', 'role': 'assistant'}]