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': 'A 60 year old male patient operated for cataract 6 months back now complains of floaters and sudden loss of vision. The diagnosis is : \nSelect and explain. \nA. Vitreous hemorrhage, B. Retinal detachment, C. Central retinal aery occlusion, D. Cystoid macular edema', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Retinal detachment', 'role': 'assistant'}]