This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ocular trauma , Subject name: Ophthalmology
[{'content': 'Ine foreign body in the eye - \nSelect and explain. \nA. Nickel, B. Copper, C. Iron, D. Silver', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ine substances- glass, plastic, porcelain and metals like gold, silver, platinum and titanium ( no reaction) Suppurative reaction is excited by pure copper, zinc, nickel and mercury paicles. Specific reactions are prodeuced by iron (siderosis bulbi) and copper alloys (chalcosis). Ref : Parsons' 22 nd edition, page no.395", 'role': 'assistant'}]