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: Surgery
Which among the following causes staining of burnt area 
Select and explain. 
A. Sulfamylon, B. Povidone iodine, C. Silver nitrate, D. Mafenide
C: Silver nitrate
Answer: C: Silver nitrate 
Explanation: Silver nitrate causes staining of burnt area.