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': 'Which laser is used for Posterior capsular cataract \nSelect and explain. \nA. Krypton, B. ND-YAG, C. Argon, D. Diode laser', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. (b) ND-YAGRef: A.K. Khurana 6th ed. /187-89* ND-YAG (Neodymium- Yttrium-Aluminium-Garnet) laser is used for posterior capsulotomy in after cataract.* Diode, Argon and Krypton laser is used for retinal photocoagulation.', 'role': 'assistant'}]