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
Ine foreign body in the eye - 
Select and explain. 
A. Nickel, B. Copper, C. Iron, D. Silver
D: Silver
Answer: D: Silver 
Explanation: 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