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': 'Rubella cataract is seen as – \nSelect and explain. \nA. Posterior polar cataract, B. Nuclear cataract, C. Blue dot cataract in young, D. Cuneiform cataract', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Congenital rubella infection can cause congenital nuclear cataract and congenital total cataract.\nSometimes it may also cause lamellar (zonular) cataract.', 'role': 'assistant'}]