This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Vitreous and retina, Subject name: Ophthalmology
[{'content': 'Ring scotoma is seen in \nSelect and explain. \nA. High myopia, B. Pseudophakia, C. Hypermetropia, D. Astigmatism', 'role': 'user'}, {'content': 'Answer: A \nExplanation: (Refer: AK Khurana Comprehensive Ophthalmology, 6th edition, pg no. 233) The scotoma is a defect in the visual field and corresponds to the degenerated zones of the retinaAnnular or ring-shaped scotoma is a typical feature which corresponds to the degenerated equatorial zone of the retinaRing scotoma is seen in retinitis pigmentosa, high myopia, POAG, aphakic spectacle correction and after panretinal photocoagulation.', 'role': 'assistant'}]