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
LASER used in removing posterior capsular opacification: 
Select and explain. 
A. Nd YAG, B. Helium, C. Femtolaser, D. Argon
A: Nd YAG
Answer: A: Nd YAG 
Explanation: 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.