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 capsular cataract is treated by which laser? 
Select and explain. 
A. Argon laser, B. CO2 laser, C. Excimer, D. Nd YAG
D: Nd YAG
Answer: D: Nd YAG 
Explanation: Ans. (d) Nd YAGRef: Khurana 4/ey p 431