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': 'Ring scotoma is seen in: September 2012 \nSelect and explain. \nA. Glaucoma, B. Retinitis pigmentosa, C. Sympathetic ophthalmia, D. Vitreous hemorrhage', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B i.e. Retinitis pigmentosa', 'role': 'assistant'}]