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': 'In posterior capsular cataract, treatment is – \nSelect and explain. \nA. Krypton Laser, B. Nd – YAG Laser, C. Argon Laser, D. CO2 Laser', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Thin after cataract can be cleared centrally by Nd : YAG laser capsulotomy.', 'role': 'assistant'}]