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': 'Most common type of cataract following radiation is: \nSelect and explain. \nA. Posterior subcapsular, B. Anterior subcapsular, C. Tear-drop cataract, D. Diffuse cataract', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. Posterior subcapsular', 'role': 'assistant'}]