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': 'Laser capsulotomy is done for ? \nSelect and explain. \nA. Pseudophakic bullous keratopathy, B. After cataract, C. Cystoid macular edema, D. Retinal detachment', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., After cataract Thin membranous after cataract and thickened posterior capsule are best treated by YAG-laser capsulotomy or discission with cystitome or Zeigler's knife.", 'role': 'assistant'}]