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: Medicine
[{'content': 'Most common ophthalmological manifestations of the X-linked form of Alpo syndrome is: \nSelect and explain. \nA. Dot and flake retinopathy, B. Anterior lenticonus, C. Posterior polymorphous corneal dystrophy, D. Posterior lenticonus', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The typical ophthalmological manifestations of the X-linked form of AS are 1. Dot-and-fleck retinopathy which occur in about 85% of affected adult males And 2. Anterior lenticonus which occur in about v25% Other additional ocular abnormalities are: 1. Recurrent corneal epithelial erosions 2. Posterior polymorphous corneal dystrophy 3. Posterior lenticonus 4. Macular holes 5. Retinal detachment The ocular manifestations presents after renal abnormalities manifest The dot-and-fleck retinopathy is not associated visual impairment or night blindness. Ref: Dan Med Bull 2009;56:105-52', 'role': 'assistant'}]