This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Surgical Techniques for Cataract Extraction, Subject name: Ophthalmology
[{'content': 'Posterior capsulotomy after cataract is done using- \nSelect and explain. \nA. Argon Laser, B. Nd YAg, C. Holmium, D. Diode laser', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Nd YAg o After cataract, if thin, can be cleared centrally by Nd: YAG laser capsulotomy. Discission with cystitome or zeigler's knife may also be used. Thick membranous after cataract needs surgical membranectomy.", 'role': 'assistant'}]