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': 'Onion ring Appearance is seen in \nSelect and explain. \nA. Lamellar Cataract, B. Capuliform, C. Myotonic dystrophy, D. Posterior polar Cataract', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Onion ring/whorled\xa0Appearance \xa0seen in\xa0Posterior polar Cataract.', 'role': 'assistant'}]