This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Ophthalmology
[{'content': 'Rosette cataract is seen due to: \nSelect and explain. \nA. Trauma, B. Copper foreign body, C. Diabetes, D. Hyperparathyroidism', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Trauma. Ring/ pettal shaped marking on the lens. Ref: AK khurana 7th ed.', 'role': 'assistant'}]