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 features of an acute attack of primary narrow-angle glaucoma except: \nSelect and explain. \nA. Intraocular pressure is raised up to 940-70 mm of Hg, B. Eye is red, painful and tender, C. Disc shows glaucomatous cupping, D. Fellow eye also shows shallow anterior chamber', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. Disc shows glaucomatous cupping', 'role': 'assistant'}]