This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cataract, Subject name: Ophthalmology
[{'content': 'LASER used in removing posterior capsular opacification: \nSelect and explain. \nA. Nd YAG, B. Helium, C. Femtolaser, D. Argon', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Nd YAG laser is used for posterior capsulotomy. Opacification can be of two types: Anterior capsular opacification. Posterior capsular opacification. Posterior capsular opacification can be of two types: Soemeering Ring. Elsching pearls. Prevention: Polishing of posterior capsule intra-operatively. Using of square edge design IOL. Treatment: Nd YAG Capsulotomy.', 'role': 'assistant'}]