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': 'Polychromatic lustre is seen in: \nSelect and explain. \nA. Complicated cataract, B. Diabetes mellitus, C. Post-radiation cataract, D. Congenital cataract', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Complicated cataract', 'role': 'assistant'}]