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': 'Leukocoria can be seen in all except – \nSelect and explain. \nA. Persistant hyperplastic primary vitreous, B. Congenital glaucoma, C. Fungal endopthalmitis, D. Retinoblastoma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Congenital cataract (not congenital glaucoma) can cause leukocoria.', 'role': 'assistant'}]