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': 'MC retained foreign body intraocularly \nSelect and explain. \nA. Airgun pellets, B. Iron, C. Glass, D. Chisel and hammer', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Iron The foreign bodies most likely to penetrate and be retained in the eye are minute chips of iron or steel (accounting for 90% all foreign bodies in industry)Q In chipping stone with an iron chisel, it is commonly a chip of the chisel and not of the stone() which enters the eye', 'role': 'assistant'}]