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
Posterior capsulotomy after cataract is done using- 
Select and explain. 
A. Argon Laser, B. Nd YAg, C. Holmium, D. Diode laser
B: Nd YAg
Answer: B: Nd YAg 
Explanation: 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.