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
[{'content': 'After/ secondary cataract is opacity of lens: \nSelect and explain. \nA. After extracapsular extraction of the lens, B. After Nd: YAG laser irodotomy, C. After peripheral iridectomy, D. Due to nutritional deficiency', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A i.e. After extracapsular extraction of the lens', 'role': 'assistant'}]