This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Ophthalmology
After/ secondary cataract is opacity of lens: 
Select and explain. 
A. After extracapsular extraction of the lens, B. After Nd: YAG laser irodotomy, C. After peripheral iridectomy, D. Due to nutritional deficiency
A: After extracapsular extraction of the lens
Answer: A: After extracapsular extraction of the lens 
Explanation: Ans. A i.e. After extracapsular extraction of the lens