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': 'Early sign of glaucoma includes following except; \nSelect and explain. \nA. Nerve fibre atroiphy, B. Peripheral halo, C. Veical cup, D. Horizontal cup', 'role': 'user'}, {'content': 'Answer: D \nExplanation: D i.e. Horizontal cup Veically oval cup is seen in early glaucoma where as marked (total) bean pot cupping is seen in advanced glaucoma Q', 'role': 'assistant'}]