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-years 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 artery occlusion, D. Cystoid macular edema', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Late complications of cataract surgery are cystoid macular oedema, retinal detachment, epithelial in growth, fibrous in growth, vitreous touch syndrome, after cataract.\nRetinal detachment (rhegmatogenous) presents with sudden painless loss of vision with floaters and photopsia.', 'role': 'assistant'}]