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
Laser capsulotomy is done for - 
Select and explain. 
A. Pseudophakic bullous keratopathy, B. After cataract, C. Cystoid macular edema, D. Retinal detachment
B: After cataract
Answer: B: After cataract 
Explanation: Ans. is 'b' i.e., After cataract o Thin membranous after cataract and thickened posterior capsule are best treated by YAG-laser capsulotomy or discission with cystitome or Zeigler's knife.