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': 'An a phake wearing aphakic glasses will most commonly notice: \nSelect and explain. \nA. Pincushion distoion, B. Spherical aberration, C. Barrel distoion, D. Chromatic aberration', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. Pincushion distoion', 'role': 'assistant'}]